From: Kris Shannon <kris@shannon.id.au>
Date: Mon, 2 Mar 2009 08:47:37 +0000 (+1100)
Subject: Fix kernel NULL pointer dereference in xen-blkfront
X-Git-Tag: v2.6.29-rc8~68^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a1a15ac5f9aeee521c048a88fc1aec848e623de7;p=pandora-kernel.git

Fix kernel NULL pointer dereference in xen-blkfront

When booting Xen Dom0 on a pre-release 3.2.1 hypervisor the system Oopses on a
"Unable to handle kernel NULL pointer dereference" in xenwatch.

From the backtrace it looks like backend_changed is calling bdget_disk
with a NULL pointer.  Checking for NULL and returning ENODEV instead
allows the kernel to boot.
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