linux-kernel - [PATCH 3.2 044/110] NET: ROSE: Don't dereference NULL neighbour pointer.

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Date:	Mon, 10 Aug 2015 12:12:31 +0200
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "Ralf Baechle" <ralf@...ux-mips.org>,
	"David S. Miller" <davem@...emloft.net>,
	"Bernard Pidoux" <f6bvp@...e.fr>
Subject: [PATCH 3.2 044/110] NET: ROSE: Don't dereference NULL neighbour
 pointer.

3.2.71-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Ralf Baechle <ralf@...ux-mips.org>

commit d496f7842aada20c61e6044b3395383fa972872c upstream.

A ROSE socket doesn't necessarily always have a neighbour pointer so check
if the neighbour pointer is valid before dereferencing it.

Signed-off-by: Ralf Baechle <ralf@...ux-mips.org>
Tested-by: Bernard Pidoux <f6bvp@...e.fr>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 net/rose/af_rose.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/net/rose/af_rose.c
+++ b/net/rose/af_rose.c
@@ -195,7 +195,8 @@ static void rose_kill_by_device(struct n
 
 		if (rose->device == dev) {
 			rose_disconnect(s, ENETUNREACH, ROSE_OUT_OF_ORDER, 0);
-			rose->neighbour->use--;
+			if (rose->neighbour)
+				rose->neighbour->use--;
 			rose->device = NULL;
 		}
 	}

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