linux-kernel - [34-longterm 082/196] can: Add missing socket check in can/bcm release.

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Message-Id: <1331598109-31424-37-git-send-email-paul.gortmaker@windriver.com>
Date:	Mon, 12 Mar 2012 20:19:55 -0400
From:	Paul Gortmaker <paul.gortmaker@...driver.com>
To:	stable@...nel.org, linux-kernel@...r.kernel.org
Cc:	stable-review@...nel.org, Dave Jones <davej@...hat.com>,
	"David S. Miller" <davem@...emloft.net>,
	Paul Gortmaker <paul.gortmaker@...driver.com>
Subject: [34-longterm 082/196] can: Add missing socket check in can/bcm release.

From: Dave Jones <davej@...hat.com>

                   -------------------
    This is a commit scheduled for the next v2.6.34 longterm release.
    If you see a problem with using this for longterm, please comment.
                   -------------------

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 <davej@...hat.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Paul Gortmaker <paul.gortmaker@...driver.com>
---
 net/can/bcm.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/net/can/bcm.c b/net/can/bcm.c
index dd23fb1..a6445fd 100644
--- a/net/can/bcm.c
+++ b/net/can/bcm.c
@@ -1426,9 +1426,14 @@ 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);
-- 
1.7.9.3

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