avoid leak upon failed realloc

Jim Meyering
2007-06-16T17:31:03Z

Here's a tiny fix to avoid a leak when realloc fails:

2007-06-16 Jim Meyering <jim@meyering.net>

* tdb.c (tdb_append): Don't leak a buffer when realloc fails.

diff -r 777972a573b3 lib/ext2fs/tdb.c
--- a/lib/ext2fs/tdb.c Fri Jun 15 18:05:09 2007 +0200
+++ b/lib/ext2fs/tdb.c Sat Jun 16 19:28:50 2007 +0200
@@ -3460,8 +3460,15 @@ int tdb_append(struct tdb_context *tdb,
if (dbuf.dptr == NULL) {
dbuf.dptr = (unsigned char *)malloc(new_dbuf.dsize);
} else {
- dbuf.dptr = (unsigned char *)realloc(dbuf.dptr,
- dbuf.dsize + new_dbuf.dsize);
+ unsigned char *new_dptr
+ = (unsigned char *)realloc(dbuf.dptr,
+ dbuf.dsize + new_dbuf.dsize);
+ if (new_dptr == NULL) {
+ free(dbuf.dptr);
+ dbuf.dptr = NULL;
+ } else {
+ dbuf.dptr = new_dptr;
+ }
}

if (dbuf.dptr == NULL) {

Signed-off-by: Jim Meyering <jim@meyering.net>