can: Add missing socket check in can/bcm release.
We can get here with a NULL socket argument passed from userspace,
so we need to handle it accordingly.
Signed-off-by: Dave Jones <davej@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/can/bcm.c b/net/can/bcm.c
index 57b1aed..8a6a05e 100644
--- a/net/can/bcm.c
+++ b/net/can/bcm.c
@@ -1427,9 +1427,14 @@
static int bcm_release(struct socket *sock)
{
struct sock *sk = sock->sk;
- struct bcm_sock *bo = bcm_sk(sk);
+ struct bcm_sock *bo;
struct bcm_op *op, *next;
+ if (sk == NULL)
+ return 0;
+
+ bo = bcm_sk(sk);
+
/* remove bcm_ops, timer, rx_unregister(), etc. */
unregister_netdevice_notifier(&bo->notifier);