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Fix buffer overflow (#218)

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See oss-fuzz/28787
This commit is contained in:
Evan Miller
2020-12-18 19:42:11 -05:00
committed by GitHub
parent 78bbf4250e
commit 50c9bdfee6
1 changed files with 4 additions and 0 deletions
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4
src/libmdb/map.c
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@@ -24,6 +24,10 @@ mdb_map_find_next0(MdbHandle *mdb, unsigned char *map, unsigned int map_sz, guin
guint32 pgnum, i, usage_bitlen; guint32 pgnum, i, usage_bitlen;
unsigned char *usage_bitmap; unsigned char *usage_bitmap;
if (map_sz < 5) {
return 0;
}
pgnum = mdb_get_int32(map, 1); pgnum = mdb_get_int32(map, 1);
usage_bitmap = map + 5; usage_bitmap = map + 5;
usage_bitlen = (map_sz - 5) * 8; usage_bitlen = (map_sz - 5) * 8;