[PATCH net] l2tp: take PMTU from tunnel UDP socket

When l2tp driver tries to get PMTU for the tunnel destination, it uses
the pointer to struct sock that represents PPPoX socket, while it
should use the pointer that represents UDP socket of the tunnel.

Signed-off-by: Dmitry Petukhov <redacted>
---
 net/l2tp/l2tp_ppp.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/l2tp/l2tp_ppp.c b/net/l2tp/l2tp_ppp.c
index d276e2d..950909f 100644
--- a/net/l2tp/l2tp_ppp.c
+++ b/net/l2tp/l2tp_ppp.c

@@ -753,9 +753,9 @@ static int pppol2tp_connect(struct socket *sock,

struct sockaddr *uservaddr,
        session->deref = pppol2tp_session_sock_put;

        /* If PMTU discovery was enabled, use the MTU that was discovered */
-       dst = sk_dst_get(sk);
+       dst = sk_dst_get(tunnel->sock);
        if (dst != NULL) {
-               u32 pmtu = dst_mtu(__sk_dst_get(sk));
+               u32 pmtu = dst_mtu(__sk_dst_get(tunnel->sock));
                if (pmtu != 0)
                        session->mtu = session->mru = pmtu -
                                PPPOL2TP_HEADER_OVERHEAD;
--
1.7.9.5

From: Dmitry Petukhov <redacted>
Date: Tue, 8 Apr 2014 21:15:50 +0600

Your patch has been corrupted by your email client, please fix this up
and resubmit.