Patch "tipc: fix hanging poll() for stream sockets" has been added to the 4.14-stable tree

This is a note to let you know that I've just added the patch titled

tipc: fix hanging poll() for stream sockets

to the 4.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
tipc-fix-hanging-poll-for-stream-sockets.patch
and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Parthasarathy Bhuvaragan <[email protected]>
Date: Thu, 28 Dec 2017 12:03:06 +0100
Subject: tipc: fix hanging poll() for stream sockets

From: Parthasarathy Bhuvaragan <[email protected]>

[ Upstream commit 517d7c79bdb39864e617960504bdc1aa560c75c6 ]

In commit 42b531de17d2f6 ("tipc: Fix missing connection request handling"), we replaced unconditional wakeup() with condtional wakeup for clients with flags POLLIN | POLLRDNORM | POLLRDBAND.

This breaks the applications which do a connect followed by poll with POLLOUT flag. These applications are not woken when the connection is ESTABLISHED and hence sleep forever.

In this commit, we fix it by including the POLLOUT event for sockets in TIPC_CONNECTING state.

---
 net/tipc/socket.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

@@ -709,11 +709,11 @@ static unsigned int tipc_poll(struct fil
 
 	switch (sk->sk_state) {
 	case TIPC_ESTABLISHED:
+	case TIPC_CONNECTING:
 		if (!tsk->cong_link_cnt && !tsk_conn_cong(tsk))
 			mask |= POLLOUT;
 		/* fall thru' */
 	case TIPC_LISTEN:
-	case TIPC_CONNECTING:
 		if (!skb_queue_empty(&sk->sk_receive_queue))
 			mask |= (POLLIN | POLLRDNORM);
 		break;

Patches currently in stable-queue which might be from [email protected] are

queue-4.14/tipc-fix-hanging-poll-for-stream-sockets.patch