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tipc: fix wrong socket reference counter after tipc_sk_timeout() returns 

When tipc_sk_timeout() is executed but user space is grabbing
ownership, this function rearms itself and returns. However, the
socket reference counter is not reduced. This causes potential
unexpected behavior.

This commit fixes it by calling sock_put() before tipc_sk_timeout()
returns in the above-mentioned case.

Fixes: afe8792fec ("tipc: refactor function tipc_sk_timeout()")
Signed-off-by: Tung Nguyen <tung.q.nguyen@dektech.com.au>
Acked-by: Ying Xue <ying.xue@windriver.com>
Acked-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tung Nguyen 2019-11-28 10:10:06 +07:00 committed by David S. Miller
parent 2fe97a578d
commit 91a4a3eb43
1 changed files with 1 additions and 0 deletions
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net/tipc/socket.c
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@ -2759,6 +2759,7 @@ static void tipc_sk_timeout(struct timer_list *t)
if (sock_owned_by_user(sk)) {
sk_reset_timer(sk, &sk->sk_timer, jiffies + HZ / 20);
bh_unlock_sock(sk);
sock_put(sk);
return;
}