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Date: Sun, 11 Nov 2018 19:49:05 +0000
From: Ben Hutchings <ben@...adent.org.uk>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC: akpm@...ux-foundation.org,
"Guillaume Nault" <g.nault@...halink.fr>,
"David S. Miller" <davem@...emloft.net>
Subject: [PATCH 3.16 144/366] l2tp: filter out non-PPP sessions in
pppol2tp_tunnel_ioctl()
3.16.61-rc1 review patch. If anyone has any objections, please let me know.
------------------
From: Guillaume Nault <g.nault@...halink.fr>
commit ecd012e45ab5fd76ed57546865897ce35920f56b upstream.
pppol2tp_tunnel_ioctl() can act on an L2TPv3 tunnel, in which case
'session' may be an Ethernet pseudo-wire.
However, pppol2tp_session_ioctl() expects a PPP pseudo-wire, as it
assumes l2tp_session_priv() points to a pppol2tp_session structure. For
an Ethernet pseudo-wire l2tp_session_priv() points to an l2tp_eth_sess
structure instead, making pppol2tp_session_ioctl() access invalid
memory.
Fixes: d9e31d17ceba ("l2tp: Add L2TP ethernet pseudowire support")
Signed-off-by: Guillaume Nault <g.nault@...halink.fr>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
net/l2tp/l2tp_ppp.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/net/l2tp/l2tp_ppp.c
+++ b/net/l2tp/l2tp_ppp.c
@@ -1231,7 +1231,7 @@ static int pppol2tp_tunnel_ioctl(struct
l2tp_session_get(sock_net(sk), tunnel,
stats.session_id, true);
- if (session) {
+ if (session && session->pwtype == L2TP_PWTYPE_PPP) {
err = pppol2tp_session_ioctl(session, cmd,
arg);
if (session->deref)
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