2.6.38-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Dave Jones <[email protected]>

commit c6914a6f261aca0c9f715f883a353ae7ff51fe83 upstream.

We can get here with a NULL socket argument passed from userspace,
so we need to handle it accordingly.

Signed-off-by: Dave Jones <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

---
 net/can/bcm.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

--- a/net/can/bcm.c
+++ b/net/can/bcm.c
@@ -1427,9 +1427,14 @@ static int bcm_init(struct sock *sk)
 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);


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