This is a note to let you know that I've just added the patch titled

l2tp: hold tunnel in pppol2tp_connect()

to the 4.13-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: l2tp-hold-tunnel-in-pppol2tp_connect.patch and it can be found in the queue-4.13 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From foo@baz Wed Nov 15 17:25:34 CET 2017

From: Guillaume Nault g.nault@alphalink.fr Date: Mon, 30 Oct 2017 17:58:58 +0100 Subject: l2tp: hold tunnel in pppol2tp_connect()

From: Guillaume Nault g.nault@alphalink.fr

[ Upstream commit f9e56baf03f9d36043a78f16e3e8b2cfd211e09e ]

Use l2tp_tunnel_get() in pppol2tp_connect() to ensure the tunnel isn't going to disappear while processing the rest of the function.

Fixes: fd558d186df2 ("l2tp: Split pppol2tp patch into separate l2tp and ppp parts") Signed-off-by: Guillaume Nault g.nault@alphalink.fr Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- net/l2tp/l2tp_ppp.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-)

--- a/net/l2tp/l2tp_ppp.c +++ b/net/l2tp/l2tp_ppp.c @@ -584,6 +584,7 @@ static int pppol2tp_connect(struct socke u32 tunnel_id, peer_tunnel_id; u32 session_id, peer_session_id; bool drop_refcnt = false; + bool drop_tunnel = false; int ver = 2; int fd;

@@ -652,7 +653,9 @@ static int pppol2tp_connect(struct socke if (tunnel_id == 0) goto end;

- tunnel = l2tp_tunnel_find(sock_net(sk), tunnel_id); + tunnel = l2tp_tunnel_get(sock_net(sk), tunnel_id); + if (tunnel) + drop_tunnel = true;

/* Special case: create tunnel context if session_id and * peer_session_id is 0. Otherwise look up tunnel using supplied @@ -781,6 +784,8 @@ out_no_ppp: end: if (drop_refcnt) l2tp_session_dec_refcount(session); + if (drop_tunnel) + l2tp_tunnel_dec_refcount(tunnel); release_sock(sk);

return error;

Patches currently in stable-queue which might be from g.nault@alphalink.fr are

queue-4.13/ppp-fix-race-in-ppp-device-destruction.patch queue-4.13/l2tp-hold-tunnel-in-pppol2tp_connect.patch queue-4.13/l2tp-check-ps-sock-before-running-pppol2tp_session_ioctl.patch