From: David Howells <dhowells@redhat.com>
Date: Thu, 22 Feb 2018 14:38:14 +0000
Subject: rxrpc: Fix send in rxrpc_send_data_packet()
Git-commit: 93c62c45ed5fad1b87e3a45835b251cd68de9c46
Patch-mainline: v4.16-rc3
References: networking-stable-18_03_07

All the kernel_sendmsg() calls in rxrpc_send_data_packet() need to send
both parts of the iov[] buffer, but one of them does not.  Fix it so that
it does.

Without this, short IPv6 rxrpc DATA packets may be seen that have the rxrpc
header included, but no payload.

Fixes: 5a924b8951f8 ("rxrpc: Don't store the rxrpc header in the Tx queue sk_buffs")
Reported-by: Marc Dionne <marc.dionne@auristor.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
 net/rxrpc/output.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/rxrpc/output.c
+++ b/net/rxrpc/output.c
@@ -391,7 +391,7 @@ send_fragmentable:
 					(char *)&opt, sizeof(opt));
 		if (ret == 0) {
 			ret = kernel_sendmsg(conn->params.local->socket, &msg,
-					     iov, 1, iov[0].iov_len);
+					     iov, 2, len);
 
 			opt = IPV6_PMTUDISC_DO;
 			kernel_setsockopt(conn->params.local->socket,