[TIPC]: Allow stream receive to read from multiple TIPC messages

This patch allows a stream socket to receive data from multiple
TIPC messages in its receive queue, without requiring the use of
the MSG_WAITALL flag.

Acknowledgements to Florian Westphal <fw-tipc@strlen.de> for
identifying this issue and suggesting how to correct it.

Signed-off-by: Allan Stephens <allan.stephens@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 1 deletions

diff --git a/net/tipc/socket.c b/net/tipc/socket.c
index 91aa2dc51771..c1a199c0fa6d 100644
--- a/net/tipc/socket.c
+++ b/net/tipc/socket.c
@@ -1065,7 +1065,9 @@ restart:
         /* Loop around if more data is required */
 
         if ((sz_copied < buf_len)    /* didn't get all requested data */
-            && (flags & MSG_WAITALL) /* ... and need to wait for more */
+            && (!skb_queue_empty(&sock->sk->sk_receive_queue) ||
+                (flags & MSG_WAITALL))
+                                     /* ... and more is ready or required */
             && (!(flags & MSG_PEEK)) /* ... and aren't just peeking at data */
             && (!err)                /* ... and haven't reached a FIN */
             )