From eb29429d81e31b191f3b2bd19cf820279cec6463 Mon Sep 17 00:00:00 2001 From: Daniel Borkmann Date: Wed, 22 Aug 2018 18:09:17 +0200 Subject: [PATCH] bpf, sockmap: fix sock hash count in alloc_sock_hash_elem 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: 81110384441a ("bpf: sockmap, add hash map support") Signed-off-by: Daniel Borkmann Acked-by: John Fastabend --- kernel/bpf/sockmap.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/kernel/bpf/sockmap.c b/kernel/bpf/sockmap.c index 60ceb0e1..40c6ef9 100644 --- a/kernel/bpf/sockmap.c +++ b/kernel/bpf/sockmap.c @@ -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; -- 2.7.4