[libvirt] [PATCH 3/4] snapshot: qemu: Fix segfault and vanishing snapshots when redefining

[Eric Blake]

On 01/03/2013 06:38 AM, Peter Krempa wrote:
> When the disk alignment check done while redefining an existing snapshot
> failed, the qemu driver attempted to free the existing snapshot. As in
> the cleanup path the definition of the snapshot wasn't assigned, the
> cleanup code dereferenced a NULL pointer.
> 
> This patch changes the behavior on error paths while redefining snapshot
> in two ways:
> 
> 1) On failure, modifications done on the snapshot definiton object are

s/definiton/definition/

> rolled back.
> 
> 2) The previous definition of the data isn't freed until it's certain it
> won't be needed any more.
> 
> This change avoids the segfault and additionaly the snapshot doesn't

s/additionaly/additionally/

> vanish if re-definiton fails for some reason.

s/re-definiton/redefinition/

> ---
>  src/qemu/qemu_driver.c | 51 +++++++++++++++++++++++++++++++++++---------------
>  1 file changed, 36 insertions(+), 15 deletions(-)
> 

ACK.

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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