diff options
Diffstat (limited to 'kernel/bpf/hashtab.c')
| -rw-r--r-- | kernel/bpf/hashtab.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/kernel/bpf/hashtab.c b/kernel/bpf/hashtab.c index d234a012f046..b3ba43674310 100644 --- a/kernel/bpf/hashtab.c +++ b/kernel/bpf/hashtab.c @@ -65,6 +65,11 @@ static struct bpf_map *htab_map_alloc(union bpf_attr *attr) goto free_htab; err = -ENOMEM; + /* prevent zero size kmalloc and check for u32 overflow */ + if (htab->n_buckets == 0 || + htab->n_buckets > U32_MAX / sizeof(struct hlist_head)) + goto free_htab; + htab->buckets = kmalloc_array(htab->n_buckets, sizeof(struct hlist_head), GFP_USER | __GFP_NOWARN); |