rxrpc: Fix send in rxrpc_send_data_packet()

[ Upstream commit 93c62c45ed5fad1b87e3a45835b251cd68de9c46 ]

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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/rxrpc/output.c b/net/rxrpc/output.c
index 42410e910affbdf39691a0cb080c053b1e8aa661..cf73dc006c3bf0d3866461c63a5a7c51c161c90b 100644 (file)
--- a/net/rxrpc/output.c
+++ b/net/rxrpc/output.c
@@ -445,7 +445,7 @@ 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,