From: Pietro Borrello borrello@diag.uniroma1.it
[ Upstream commit 21cbd90a6fab7123905386985e3e4a80236b8714 ]
__inet_hash_connect() has a fast path taken if sk_head(&tb->owners) is equal to the sk parameter. sk_head() returns the hlist_entry() with respect to the sk_node field. However entries in the tb->owners list are inserted with respect to the sk_bind_node field with sk_add_bind_node(). Thus the check would never pass and the fast path never execute.
This fast path has never been executed or tested as this bug seems to be present since commit 1da177e4c3f4 ("Linux-2.6.12-rc2"), thus remove it to reduce code complexity.
Signed-off-by: Pietro Borrello borrello@diag.uniroma1.it Reviewed-by: Kuniyuki Iwashima kuniyu@amazon.com Reviewed-by: Eric Dumazet edumazet@google.com Link: https://lore.kernel.org/r/20230112-inet_hash_connect_bind_head-v3-1-b591fd21... Signed-off-by: Paolo Abeni pabeni@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- net/ipv4/inet_hashtables.c | 12 +----------- 1 file changed, 1 insertion(+), 11 deletions(-)
diff --git a/net/ipv4/inet_hashtables.c b/net/ipv4/inet_hashtables.c index d64522af9c3a8..5a272d09b8248 100644 --- a/net/ipv4/inet_hashtables.c +++ b/net/ipv4/inet_hashtables.c @@ -756,17 +756,7 @@ int __inet_hash_connect(struct inet_timewait_death_row *death_row, u32 index;
if (port) { - head = &hinfo->bhash[inet_bhashfn(net, port, - hinfo->bhash_size)]; - tb = inet_csk(sk)->icsk_bind_hash; - spin_lock_bh(&head->lock); - if (sk_head(&tb->owners) == sk && !sk->sk_bind_node.next) { - inet_ehash_nolisten(sk, NULL, NULL); - spin_unlock_bh(&head->lock); - return 0; - } - spin_unlock(&head->lock); - /* No definite answer... Walk to established hash table */ + local_bh_disable(); ret = check_established(death_row, sk, port, NULL); local_bh_enable(); return ret;