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commit    4bccceaa9179bffbe3469909e28ce4ded34f0a09
Author:   Amit Kapila <akapila@postgresql.org>
Date:     Wed Jan 13 03:01:45 2021 +0000
First released in: 14.0, 9.5.25, 9.6.21, 10.16, 11.11, 12.6, 13.2

    Fix memory leak in SnapBuildSerialize.
    
    The memory for the snapshot was leaked while serializing it to disk during
    logical decoding. This memory will be freed only once walsender stops
    streaming the changes. This can lead to a huge memory increase when master
    logs Standby Snapshot too frequently say when the user is trying to create
    many replication slots.
    
    Reported-by: funnyxj.fxj@alibaba-inc.com
    Diagnosed-by: funnyxj.fxj@alibaba-inc.com
    Author: Amit Kapila
    Backpatch-through: 9.5
    Discussion: https://postgr.es/m/033ab54c-6393-42ee-8ec9-2b399b5d8cde.funnyxj.fxj@alibaba-inc.com


 src/backend/replication/logical/snapbuild.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/backend/replication/logical/snapbuild.c b/src/backend/replication/logical/snapbuild.c
index 7bd4a74225c..56d5f9422ae 100644
--- a/src/backend/replication/logical/snapbuild.c
+++ b/src/backend/replication/logical/snapbuild.c
@@ -1447,7 +1447,7 @@ static void
 SnapBuildSerialize(SnapBuild *builder, XLogRecPtr lsn)
 {
 	Size		needed_length;
-	SnapBuildOnDisk *ondisk;
+	SnapBuildOnDisk *ondisk = NULL;
 	char	   *ondisk_c;
 	int			fd;
 	char		tmppath[MAXPGPATH];
@@ -1639,6 +1639,9 @@ SnapBuildSerialize(SnapBuild *builder, XLogRecPtr lsn)
 out:
 	ReorderBufferSetRestartPoint(builder->reorder,
 								 builder->last_serialized_snapshot);
+	/* be tidy */
+	if (ondisk)
+		pfree(ondisk);
 }
 
 /*


[parent: a8bb366ad0e5]