[PATCH] xen/netback: Fix null-pointer access in netback_uevent

[Bastian Blank <waldi@debian.org>]

The uevent method of Xen netback does not check if the the network
device is already setup and tries to dereference a null-pointer it not.

Signed-off-by: Bastian Blank <waldi@debian.org>
---
 drivers/xen/netback/xenbus.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)

diff --git a/drivers/xen/netback/xenbus.c b/drivers/xen/netback/xenbus.c
index 70636d0..88262bb 100644
--- a/drivers/xen/netback/xenbus.c
+++ b/drivers/xen/netback/xenbus.c
@@ -163,7 +163,6 @@ fail:
 static int netback_uevent(struct xenbus_device *xdev, struct kobj_uevent_env *env)
 {
 	struct backend_info *be = dev_get_drvdata(&xdev->dev);
-	struct xen_netif *netif = be->netif;
 	char *val;
 
 	DPRINTK("netback_uevent");
@@ -182,7 +181,7 @@ static int netback_uevent(struct xenbus_device *xdev, struct kobj_uevent_env *en
 		kfree(val);
 	}
 
-	if (add_uevent_var(env, "vif=%s", netif->dev->name))
+	if (be && be->netif && add_uevent_var(env, "vif=%s", be->netif->dev->name))
 		return -ENOMEM;
 
 	return 0;
-- 
1.7.1

-- 
To live is always desirable.
		-- Eleen the Capellan, "Friday's Child", stardate 3498.9