[libvirt] [PATCH] qemu_driver.c: avoid NULL dereference upon disk-op failure

[Jim Meyering <jim@xxxxxxxxxxxx>]

The local, "cgroup" is initialized to NULL, and may still
have that value when the code below is reached.
That would provoke a NULL-dereference in virCgroupDenyDevicePath.

>From c1caed370a7b2eae2e964a6059b014530143075c Mon Sep 17 00:00:00 2001
From: Jim Meyering <meyering@xxxxxxxxxx>
Date: Wed, 16 Dec 2009 14:15:50 +0100
Subject: [PATCH] qemu_driver.c: avoid NULL dereference upon disk-op failure

* src/qemu/qemu_driver.c (qemudDomainAttachDevice): Call
virCgroupDenyDevicePath only if cgroup is non-NULL.
---
 src/qemu/qemu_driver.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 9ef6c35..81afecf 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -5485,7 +5485,7 @@ static int qemudDomainAttachDevice(virDomainPtr dom,
                              virDomainDiskDeviceTypeToString(dev->data.disk->device));
             /* Fallthrough */
         }
-        if (ret != 0) {
+        if (ret != 0 && cgroup) {
             virCgroupDenyDevicePath(cgroup,
                                     dev->data.disk->src);
         }
--
1.6.6.rc2.275.g51e2d

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