WARNING - OLD ARCHIVES

This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
   
 
 
Xen 
 
Home Products Support Community News
 
   
 

xen-devel

[Xen-devel] PATCH for NULL pointer in netback_uevent

To: <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: [Xen-devel] PATCH for NULL pointer in netback_uevent
From: "James Harper" <james.harper@xxxxxxxxxxxxxxxx>
Date: Fri, 28 May 2010 10:58:17 +1000
Delivery-date: Thu, 27 May 2010 18:00:19 -0700
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
List-help: <mailto:xen-devel-request@lists.xensource.com?subject=help>
List-id: Xen developer discussion <xen-devel.lists.xensource.com>
List-post: <mailto:xen-devel@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
Sender: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
Thread-index: Acr+ANurGy/4Fs5cQRqJNaxhrk1XKA==
Thread-topic: PATCH for NULL pointer in netback_uevent
The following is sufficient to get domain creation working on my server
(see threads "null-pointer access in netback_uevent" and "oops starting
domain on 4.0.0  + 2.6.32.13-gf6fe658"). I'm not sure if it's the right
solution though - should we expect a call to netback_uevent before the
vif is properly set up? All I'm doing is returning 0 (success?) if the
drvdata hasn't been set yet.

I also think that I am seeing a different problem to Bastian, based on
his debug output.

James

diff --git a/drivers/xen/netback/xenbus.c b/drivers/xen/netback/xenbus.c
index 70636d0..a46d8b2 100644
--- a/drivers/xen/netback/xenbus.c
+++ b/drivers/xen/netback/xenbus.c
@@ -162,12 +162,16 @@ 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;
+       struct backend_info *be;
+       struct xen_netif *netif;
        char *val;

        DPRINTK("netback_uevent");

+       be = dev_get_drvdata(&xdev->dev);
+       if (!be)
+               return 0;
+       netif = be->netif;
        val = xenbus_read(XBT_NIL, xdev->nodename, "script", NULL);
        if (IS_ERR(val)) {
                int err = PTR_ERR(val);

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel

<Prev in Thread] Current Thread [Next in Thread>