l2tp: check ps->sock before running pppol2tp_session_ioctl()
authorGuillaume Nault <g.nault@alphalink.fr>
Fri, 13 Oct 2017 17:22:35 +0000 (19:22 +0200)
committerDavid S. Miller <davem@davemloft.net>
Sun, 15 Oct 2017 01:38:56 +0000 (18:38 -0700)
commit5903f594935a3841137c86b9d5b75143a5b7121c
treee673eded38ed2855ae9c49dc8e76b0e4cd5a8906
parent09001b03f722be96827bf8df5ba4d48b7ec0cc30
l2tp: check ps->sock before running pppol2tp_session_ioctl()

When pppol2tp_session_ioctl() is called by pppol2tp_tunnel_ioctl(),
the session may be unconnected. That is, it was created by
pppol2tp_session_create() and hasn't been connected with
pppol2tp_connect(). In this case, ps->sock is NULL, so we need to check
for this case in order to avoid dereferencing a NULL pointer.

Fixes: 309795f4bec2 ("l2tp: Add netlink control API for L2TP")
Signed-off-by: Guillaume Nault <g.nault@alphalink.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
net/l2tp/l2tp_ppp.c