Commit 42b531de authored Apr 26, 2017 by Parthasarathy Bhuvaragan Committed by David S. Miller Apr 28, 2017

tipc: Fix missing connection request handling



In filter_connect, we use waitqueue_active() to check for any
connections to wakeup. But waitqueue_active() is missing memory
barriers while accessing the critical sections, leading to
inconsistent results.

In this commit, we replace this with an SMP safe wq_has_sleeper()
using the generic socket callback sk_data_ready().

Signed-off-by: Parthasarathy Bhuvaragan <parthasarathy.bhuvaragan@ericsson.com>
Reviewed-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent f8324608

net/tipc/socket.c

+1 −2

Original line number	Diff line number	Diff line
		@@ -1581,8 +1581,7 @@ static bool filter_connect(struct tipc_sock tsk, struct sk_buff skb)
		return true;

		/* If empty 'ACK-' message, wake up sleeping connect() */
		if (waitqueue_active(sk_sleep(sk)))
		wake_up_interruptible(sk_sleep(sk));
		sk->sk_data_ready(sk);

		/* 'ACK-' message is neither accepted nor rejected: */
		msg_set_dest_droppable(hdr, 1);