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[PATCH 3/5] Move conversion of a "historic" to MVCC snapshot to a separate function.
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* [PATCH 3/5] Move conversion of a "historic" to MVCC snapshot to a separate function.
@ 2025-12-09 18:44 Antonin Houska <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Antonin Houska @ 2025-12-09 18:44 UTC (permalink / raw)

The conversion is now handled by SnapBuildMVCCFromHistoric(). REPACK
CONCURRENTLY will also need it.
---
 src/backend/commands/cluster.c              |  8 ++-
 src/backend/replication/logical/snapbuild.c | 57 +++++++++++++++++----
 src/backend/utils/time/snapmgr.c            |  3 +-
 src/include/replication/snapbuild.h         |  1 +
 src/include/utils/snapmgr.h                 |  1 +
 5 files changed, 53 insertions(+), 17 deletions(-)

diff --git a/src/backend/commands/cluster.c b/src/backend/commands/cluster.c
index 3afab656cd9..89f0b03a31c 100644
--- a/src/backend/commands/cluster.c
+++ b/src/backend/commands/cluster.c
@@ -70,8 +70,7 @@ typedef struct
 
 static bool cluster_rel_recheck(RepackCommand cmd, Relation OldHeap,
 								Oid indexOid, Oid userid, int options);
-static void rebuild_relation(RepackCommand cmd,
-							 Relation OldHeap, Relation index, bool verbose);
+static void rebuild_relation(Relation OldHeap, Relation index, bool verbose);
 static void copy_table_data(Relation NewHeap, Relation OldHeap, Relation OldIndex,
 							bool verbose, bool *pSwapToastByContent,
 							TransactionId *pFreezeXid, MultiXactId *pCutoffMulti);
@@ -415,7 +414,7 @@ cluster_rel(RepackCommand cmd, Relation OldHeap, Oid indexOid,
 	TransferPredicateLocksToHeapRelation(OldHeap);
 
 	/* rebuild_relation does all the dirty work */
-	rebuild_relation(cmd, OldHeap, index, verbose);
+	rebuild_relation(OldHeap, index, verbose);
 	/* rebuild_relation closes OldHeap, and index if valid */
 
 out:
@@ -629,8 +628,7 @@ mark_index_clustered(Relation rel, Oid indexOid, bool is_internal)
  * On exit, they are closed, but locks on them are not released.
  */
 static void
-rebuild_relation(RepackCommand cmd,
-				 Relation OldHeap, Relation index, bool verbose)
+rebuild_relation(Relation OldHeap, Relation index, bool verbose)
 {
 	Oid			tableOid = RelationGetRelid(OldHeap);
 	Oid			accessMethod = OldHeap->rd_rel->relam;
diff --git a/src/backend/replication/logical/snapbuild.c b/src/backend/replication/logical/snapbuild.c
index 6e18baa33cb..34bdd987478 100644
--- a/src/backend/replication/logical/snapbuild.c
+++ b/src/backend/replication/logical/snapbuild.c
@@ -440,10 +440,7 @@ Snapshot
 SnapBuildInitialSnapshot(SnapBuild *builder)
 {
 	Snapshot	snap;
-	TransactionId xid;
 	TransactionId safeXid;
-	TransactionId *newxip;
-	int			newxcnt = 0;
 
 	Assert(XactIsoLevel == XACT_REPEATABLE_READ);
 	Assert(builder->building_full_snapshot);
@@ -485,7 +482,33 @@ SnapBuildInitialSnapshot(SnapBuild *builder)
 
 	MyProc->xmin = snap->xmin;
 
-	/* allocate in transaction context */
+	/* Convert the historic snapshot to MVCC snapshot. */
+	return SnapBuildMVCCFromHistoric(snap, true);
+}
+
+/*
+ * Turn a historic MVCC snapshot into an ordinary MVCC snapshot.
+ *
+ * Unlike a regular (non-historic) MVCC snapshot, the 'xip' array of this
+ * snapshot contains not only running main transactions, but also their
+ * subtransactions. On the other hand, 'subxip' will usually be empty. This
+ * difference does not affect the result of XidInMVCCSnapshot() because it
+ * searches both in 'xip' and 'subxip'.
+ *
+ * Pass true for 'in_place' if you don't care about modifying the source
+ * snapshot. If you need a new instance, and one that was allocated as a
+ * single chunk of memory, pass false.
+ */
+Snapshot
+SnapBuildMVCCFromHistoric(Snapshot snapshot, bool in_place)
+{
+	TransactionId xid;
+	TransactionId *oldxip = snapshot->xip;
+	uint32		oldxcnt = snapshot->xcnt;
+	TransactionId *newxip;
+	int			newxcnt = 0;
+	Snapshot	result;
+
 	newxip = (TransactionId *)
 		palloc(sizeof(TransactionId) * GetMaxSnapshotXidCount());
 
@@ -495,7 +518,7 @@ SnapBuildInitialSnapshot(SnapBuild *builder)
 	 * classical snapshot by marking all non-committed transactions as
 	 * in-progress. This can be expensive.
 	 */
-	for (xid = snap->xmin; NormalTransactionIdPrecedes(xid, snap->xmax);)
+	for (xid = snapshot->xmin; NormalTransactionIdPrecedes(xid, snapshot->xmax);)
 	{
 		void	   *test;
 
@@ -503,7 +526,7 @@ SnapBuildInitialSnapshot(SnapBuild *builder)
 		 * Check whether transaction committed using the decoding snapshot
 		 * meaning of ->xip.
 		 */
-		test = bsearch(&xid, snap->xip, snap->xcnt,
+		test = bsearch(&xid, snapshot->xip, snapshot->xcnt,
 					   sizeof(TransactionId), xidComparator);
 
 		if (test == NULL)
@@ -520,11 +543,25 @@ SnapBuildInitialSnapshot(SnapBuild *builder)
 	}
 
 	/* adjust remaining snapshot fields as needed */
-	snap->snapshot_type = SNAPSHOT_MVCC;
-	snap->xcnt = newxcnt;
-	snap->xip = newxip;
+	snapshot->xcnt = newxcnt;
+	snapshot->xip = newxip;
+
+	if (in_place)
+		result = snapshot;
+	else
+	{
+		result = CopySnapshot(snapshot);
+
+		/* Restore the original values so the source is intact. */
+		snapshot->xip = oldxip;
+		snapshot->xcnt = oldxcnt;
+
+		/* newxip has been copied */
+		pfree(newxip);
+	}
+	result->snapshot_type = SNAPSHOT_MVCC;
 
-	return snap;
+	return result;
 }
 
 /*
diff --git a/src/backend/utils/time/snapmgr.c b/src/backend/utils/time/snapmgr.c
index 24f73a49d27..886060305f5 100644
--- a/src/backend/utils/time/snapmgr.c
+++ b/src/backend/utils/time/snapmgr.c
@@ -213,7 +213,6 @@ typedef struct ExportedSnapshot
 static List *exportedSnapshots = NIL;
 
 /* Prototypes for local functions */
-static Snapshot CopySnapshot(Snapshot snapshot);
 static void UnregisterSnapshotNoOwner(Snapshot snapshot);
 static void FreeSnapshot(Snapshot snapshot);
 static void SnapshotResetXmin(void);
@@ -604,7 +603,7 @@ SetTransactionSnapshot(Snapshot sourcesnap, VirtualTransactionId *sourcevxid,
  * The copy is palloc'd in TopTransactionContext and has initial refcounts set
  * to 0.  The returned snapshot has the copied flag set.
  */
-static Snapshot
+Snapshot
 CopySnapshot(Snapshot snapshot)
 {
 	Snapshot	newsnap;
diff --git a/src/include/replication/snapbuild.h b/src/include/replication/snapbuild.h
index 44031dcf6e3..6d4d2d1814c 100644
--- a/src/include/replication/snapbuild.h
+++ b/src/include/replication/snapbuild.h
@@ -73,6 +73,7 @@ extern void FreeSnapshotBuilder(SnapBuild *builder);
 extern void SnapBuildSnapDecRefcount(Snapshot snap);
 
 extern Snapshot SnapBuildInitialSnapshot(SnapBuild *builder);
+extern Snapshot SnapBuildMVCCFromHistoric(Snapshot snapshot, bool in_place);
 extern const char *SnapBuildExportSnapshot(SnapBuild *builder);
 extern void SnapBuildClearExportedSnapshot(void);
 extern void SnapBuildResetExportedSnapshotState(void);
diff --git a/src/include/utils/snapmgr.h b/src/include/utils/snapmgr.h
index 604c1f90216..f65f83c85cd 100644
--- a/src/include/utils/snapmgr.h
+++ b/src/include/utils/snapmgr.h
@@ -63,6 +63,7 @@ extern Snapshot GetTransactionSnapshot(void);
 extern Snapshot GetLatestSnapshot(void);
 extern void SnapshotSetCommandId(CommandId curcid);
 
+extern Snapshot CopySnapshot(Snapshot snapshot);
 extern Snapshot GetCatalogSnapshot(Oid relid);
 extern Snapshot GetNonHistoricCatalogSnapshot(Oid relid);
 extern void InvalidateCatalogSnapshot(void);
-- 
2.47.3


--=-=-=
Content-Type: text/plain
Content-Disposition: attachment;
 filename=v27-0004-Add-CONCURRENTLY-option-to-REPACK-command.patch



^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread

* [PATCH 2/2] Fix libxml leaks in contrib/xml2 xpath_table
@ 2026-05-25 21:11 Andrey Chernyy <[email protected]>
  0 siblings, 0 replies; 552+ messages in thread

From: Andrey Chernyy @ 2026-05-25 21:11 UTC (permalink / raw)

xpath_table() did not release libxml objects allocated while evaluating
XPath expressions.  xmlXPathCompiledEval() returns an xmlXPathObjectPtr
that must be freed, and string results copied into the tuple input array
must be freed after BuildTupleFromCStrings() has consumed them.

Track the current libxml objects across the existing PG_TRY block so they
are also released on error.
---
 contrib/xml2/xpath.c | 47 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 94819961787..ac140a640e0 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -643,6 +643,10 @@ xpath_table(PG_FUNCTION_ARGS)
 	StringInfoData query_buf;
 	PgXmlErrorContext *xmlerrcxt;
 	volatile xmlDocPtr doctree = NULL;
+	xmlXPathContextPtr volatile ctxt = NULL;
+	xmlXPathObjectPtr volatile res = NULL;
+	xmlXPathCompExprPtr volatile comppath = NULL;
+	xmlChar    *volatile resstr = NULL;
 
 	InitMaterializedSRF(fcinfo, MAT_SRF_USE_EXPECTED_DESC);
 
@@ -662,7 +666,7 @@ xpath_table(PG_FUNCTION_ARGS)
 
 	attinmeta = TupleDescGetAttInMetadata(rsinfo->setDesc);
 
-	values = (char **) palloc(rsinfo->setDesc->natts * sizeof(char *));
+	values = (char **) palloc0(rsinfo->setDesc->natts * sizeof(char *));
 	xpaths = (xmlChar **) palloc(rsinfo->setDesc->natts * sizeof(xmlChar *));
 
 	/*
@@ -732,10 +736,6 @@ xpath_table(PG_FUNCTION_ARGS)
 		{
 			char	   *pkey;
 			char	   *xmldoc;
-			xmlXPathContextPtr ctxt;
-			xmlXPathObjectPtr res;
-			xmlChar    *resstr;
-			xmlXPathCompExprPtr comppath;
 			HeapTuple	ret_tuple;
 
 			/* Extract the row data as C Strings */
@@ -780,6 +780,11 @@ xpath_table(PG_FUNCTION_ARGS)
 					had_values = false;
 					for (j = 0; j < numpaths; j++)
 					{
+						ctxt = NULL;
+						res = NULL;
+						comppath = NULL;
+						resstr = NULL;
+
 						ctxt = xmlXPathNewContext(doctree);
 						if (ctxt == NULL || pg_xml_error_occurred(xmlerrcxt))
 							xml_ereport(xmlerrcxt,
@@ -798,6 +803,7 @@ xpath_table(PG_FUNCTION_ARGS)
 						/* Now evaluate the path expression. */
 						res = xmlXPathCompiledEval(comppath, ctxt);
 						xmlXPathFreeCompExpr(comppath);
+						comppath = NULL;
 
 						if (res != NULL)
 						{
@@ -842,8 +848,16 @@ xpath_table(PG_FUNCTION_ARGS)
 							 * result tuple.
 							 */
 							values[j + 1] = (char *) resstr;
+							resstr = NULL;
+						}
+
+						if (res != NULL)
+						{
+							xmlXPathFreeObject(res);
+							res = NULL;
 						}
 						xmlXPathFreeContext(ctxt);
+						ctxt = NULL;
 					}
 
 					/* Now add the tuple to the output, if there is one. */
@@ -854,6 +868,16 @@ xpath_table(PG_FUNCTION_ARGS)
 						heap_freetuple(ret_tuple);
 					}
 
+					/* BuildTupleFromCStrings() has copied the values. */
+					for (j = 1; j < rsinfo->setDesc->natts; j++)
+					{
+						if (values[j] != NULL)
+						{
+							xmlFree((xmlChar *) values[j]);
+							values[j] = NULL;
+						}
+					}
+
 					rownr++;
 				} while (had_values);
 			}
@@ -870,6 +894,19 @@ xpath_table(PG_FUNCTION_ARGS)
 	}
 	PG_CATCH();
 	{
+		if (resstr != NULL)
+			xmlFree(resstr);
+		for (j = 1; j < rsinfo->setDesc->natts; j++)
+		{
+			if (values[j] != NULL)
+				xmlFree((xmlChar *) values[j]);
+		}
+		if (res != NULL)
+			xmlXPathFreeObject(res);
+		if (comppath != NULL)
+			xmlXPathFreeCompExpr(comppath);
+		if (ctxt != NULL)
+			xmlXPathFreeContext(ctxt);
 		if (doctree != NULL)
 			xmlFreeDoc(doctree);
 
-- 
2.54.0


--MP_/T7YUrG7W2jPQOBsjEYwqj9B--





^ permalink  raw  reply  [nested|flat] 552+ messages in thread