NET: ROSE: Don't dereference NULL neighbour pointer.

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@linux-mips.org>
Tested-by: Bernard Pidoux <f6bvp@free.fr>
Cc: stable@vger.kernel.org #2.6.11+
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 1 deletions

diff --git a/net/rose/af_rose.c b/net/rose/af_rose.c
index 8ae603069a1a..dd304bc40788 100644
--- a/net/rose/af_rose.c
+++ b/net/rose/af_rose.c
@@ -192,7 +192,8 @@ static void rose_kill_by_device(struct net_device *dev)
 
                 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;
                 }
         }