X25: Fix oops and refcnt problems from x25_dev_get

Calls to x25_dev_get check for dev = NULL which was not set.
It allowed x25 to set routes and ioctls on down interfaces.
This caused oopses and refcnt problems on device_unregister.

Signed-off-by: Andrew Hendry <andrew.hendry@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 1 deletions

diff --git a/net/x25/x25_route.c b/net/x25/x25_route.c
index 66961ea28c91..b95fae9ab393 100644
--- a/net/x25/x25_route.c
+++ b/net/x25/x25_route.c
@@ -136,8 +136,10 @@ struct net_device *x25_dev_get(char *devname)
 #if defined(CONFIG_LLC) || defined(CONFIG_LLC_MODULE)
                                         && dev->type != ARPHRD_ETHER
 #endif
-                                        )))
+                                        ))){
                 dev_put(dev);
+                dev = NULL;
+        }
 
         return dev;
 }