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l2tp: check ps->sock before running pppol2tp_session_ioctl()

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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>
This commit is contained in:
Guillaume Nault 2017-10-13 19:22:35 +02:00 committed by David S. Miller
parent 09001b03f7
commit 5903f59493
1 changed files with 3 additions and 0 deletions
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3
net/l2tp/l2tp_ppp.c
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@ -988,6 +988,9 @@ static int pppol2tp_session_ioctl(struct l2tp_session *session,
session->name, cmd, arg);
sk = ps->sock;
if (!sk)
return -EBADR;
sock_hold(sk);
switch (cmd) {