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bpf, sockmap: fix sock hash count in alloc_sock_hash_elem

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When we try to allocate a new sock hash entry and the allocation
fails, then sock hash map fails to reduce the map element counter,
meaning we keep accounting this element although it was never used.
Fix it by dropping the element counter on error.

Fixes: 8111038444 ("bpf: sockmap, add hash map support")
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: John Fastabend <john.fastabend@gmail.com>
This commit is contained in:
Daniel Borkmann 2018-08-22 18:09:17 +02:00
parent b845c898b2
commit eb29429d81
1 changed files with 3 additions and 1 deletions
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4
kernel/bpf/sockmap.c
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@ -2269,8 +2269,10 @@ static struct htab_elem *alloc_sock_hash_elem(struct bpf_htab *htab,
}
l_new = kmalloc_node(htab->elem_size, GFP_ATOMIC | __GFP_NOWARN,
htab->map.numa_node);
if (!l_new)
if (!l_new) {
atomic_dec(&htab->count);
return ERR_PTR(-ENOMEM);
}
memcpy(l_new->key, key, key_size);
l_new->sk = sk;