linux-kernel - [PATCH] [29/98] can: Add missing socket check in can/bcm release.

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Date:	Tue, 26 Jul 2011 17:35:21 -0700 (PDT)
From:	Andi Kleen <andi@...stfloor.org>
To:	davej@...hat.com, davem@...emloft.net, gregkh@...e.de,
	ak@...ux.intel.com, linux-kernel@...r.kernel.org,
	stable@...nel.org, tim.bird@...sony.com,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: [PATCH] [29/98] can: Add missing socket check in can/bcm release.

2.6.35-longterm review patch.  If anyone has any objections, please let me know.

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

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: Greg Kroah-Hartman <gregkh@...e.de>
Signed-off-by: Andi Kleen <ak@...ux.intel.com>

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

Index: linux-2.6.35.y/net/can/bcm.c
===================================================================
--- linux-2.6.35.y.orig/net/can/bcm.c
+++ linux-2.6.35.y/net/can/bcm.c
@@ -1424,9 +1424,14 @@ 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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