2009/12/16 Jim Meyering <jim(a)meyering.net&gt;: > 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(a)redhat.com&gt; > 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 > ACK.