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libbpf: Fix memory leak and possible double-free in hashmap__clear

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Fix memory leak in hashmap_clear() not freeing hashmap_entry structs for each
of the remaining entries. Also NULL-out bucket list to prevent possible
double-free between hashmap__clear() and hashmap__free().

Running test_progs-asan flavor clearly showed this problem.

Reported-by: Alston Tang <alston64@fb.com>
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200429012111.277390-5-andriin@fb.com
This commit is contained in:
Andrii Nakryiko 2020-04-28 18:21:04 -07:00 committed by Alexei Starovoitov
parent 42fce2cfb4
commit 229bf8bf4d
1 changed files with 7 additions and 0 deletions
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7
tools/lib/bpf/hashmap.c
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@ -59,7 +59,14 @@ struct hashmap *hashmap__new(hashmap_hash_fn hash_fn,
void hashmap__clear(struct hashmap *map)
{
struct hashmap_entry *cur, *tmp;
int bkt;
hashmap__for_each_entry_safe(map, cur, tmp, bkt) {
free(cur);
}
free(map->buckets);
map->buckets = NULL;
map->cap = map->cap_bits = map->sz = 0;
}