Commit 51a00daf authored Feb 08, 2015 by Jon Paul Maloy Committed by David S. Miller Feb 08, 2015

tipc: fix bug in socket reception function



In commit c637c103 ("tipc: resolve race
problem at unicast message reception") we introduced a time limit
for how long the function tipc_sk_eneque() would be allowed to execute
its loop. Unfortunately, the test for when this limit is passed was put
in the wrong place, resulting in a lost message when the test is true.

We fix this by moving the test to before we dequeue the next buffer
from the input queue.

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

parent 662f5533

net/tipc/socket.c

+2 −3

Original line number	Diff line number	Diff line
		@@ -1802,12 +1802,11 @@ static int tipc_sk_enqueue(struct sk_buff_head inputq, struct sock sk,
		unsigned long time_limit = jiffies + 2;

		while (skb_queue_len(inputq)) {
		if (unlikely(time_after_eq(jiffies, time_limit)))
		return TIPC_OK;
		skb = tipc_skb_dequeue(inputq, dport);
		if (unlikely(!skb))
		return TIPC_OK;
		/* Return if softirq window exhausted */
		if (unlikely(time_after_eq(jiffies, time_limit)))
		return TIPC_OK;
		if (!sock_owned_by_user(sk)) {
		err = filter_rcv(sk, &skb);
		if (likely(!skb))