postgres.git / summary / log / commit / refs

commit    ff9d757c67786b389f19abc3187d158adda500d8
Author:   Heikki Linnakangas <heikki.linnakangas@iki.fi>
Date:     Fri Mar 07 11:13:33 2014 +0000
First released in: 9.4.0, 8.4.21, 9.0.17, 9.1.13, 9.2.8, 9.3.4

    Avoid memcpy() with same source and destination address.
    
    The behavior of that is undefined, although unlikely to lead to problems in
    practice.
    
    Found by running regression tests with Valgrind.


 src/backend/tsearch/dict_ispell.c | 9 ++++-----
 src/backend/utils/adt/tsvector.c  | 3 ++-
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/src/backend/tsearch/dict_ispell.c b/src/backend/tsearch/dict_ispell.c
index b6959e90e30..1cda70d2c43 100644
--- a/src/backend/tsearch/dict_ispell.c
+++ b/src/backend/tsearch/dict_ispell.c
@@ -127,20 +127,19 @@ dispell_lexize(PG_FUNCTION_ARGS)
 	if (res == NULL)
 		PG_RETURN_POINTER(NULL);
 
-	ptr = cptr = res;
-	while (ptr->lexeme)
+	cptr = res;
+	for (ptr = cptr; ptr->lexeme; ptr++)
 	{
 		if (searchstoplist(&(d->stoplist), ptr->lexeme))
 		{
 			pfree(ptr->lexeme);
 			ptr->lexeme = NULL;
-			ptr++;
 		}
 		else
 		{
-			memcpy(cptr, ptr, sizeof(TSLexeme));
+			if (cptr != ptr)
+				memcpy(cptr, ptr, sizeof(TSLexeme));
 			cptr++;
-			ptr++;
 		}
 	}
 	cptr->lexeme = NULL;
diff --git a/src/backend/utils/adt/tsvector.c b/src/backend/utils/adt/tsvector.c
index 397e6c780bf..0dbbc9368bf 100644
--- a/src/backend/utils/adt/tsvector.c
+++ b/src/backend/utils/adt/tsvector.c
@@ -125,7 +125,8 @@ uniqueentry(WordEntryIN *a, int l, char *buf, int *outbuflen)
 				buflen += res->poslen * sizeof(WordEntryPos) + sizeof(uint16);
 			}
 			res++;
-			memcpy(res, ptr, sizeof(WordEntryIN));
+			if (res != ptr)
+				memcpy(res, ptr, sizeof(WordEntryIN));
 		}
 		else if (ptr->entry.haspos)
 		{


[parent: fb61ff85e166]