4.20-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Erik Hugne <erik.hu...@gmail.com>

[ Upstream commit 0e63208915a8d7590d0a6218dadb2a6a00ac705a ]

Fix regression bug introduced in
commit 365ad353c256 ("tipc: reduce risk of user starvation during link
congestion")

Only signal -EDESTADDRREQ for RDM/DGRAM if we don't have a cached
sockaddr.

Fixes: 365ad353c256 ("tipc: reduce risk of user starvation during link 
congestion")
Signed-off-by: Erik Hugne <erik.hu...@gmail.com>
Signed-off-by: Jon Maloy <jon.ma...@ericsson.com>
Signed-off-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 net/tipc/socket.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/tipc/socket.c
+++ b/net/tipc/socket.c
@@ -1320,7 +1320,7 @@ static int __tipc_sendmsg(struct socket
 
        if (unlikely(!dest)) {
                dest = &tsk->peer;
-               if (!syn || dest->family != AF_TIPC)
+               if (!syn && dest->family != AF_TIPC)
                        return -EDESTADDRREQ;
        }
 


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