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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>
This commit is contained in:
Dave Jones 2011-04-19 20:36:59 -07:00 committed by David S. Miller
parent 0b0dc0f17f
commit c6914a6f26
1 changed files with 6 additions and 1 deletions
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7
net/can/bcm.c
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@ -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);