[libvirt] [PATCH] Fix crash in QEMU auto-destroy with transient guests

[Eric Blake]

On 02/28/2013 05:19 AM, Daniel P. Berrange wrote:
> From: "Daniel P. Berrange" <berrange at redhat.com>
> 
> When the auto-destroy callback runs it is supposed to return
> NULL if the virDomainObjPtr is no longer valid. It was not
> doing this for transient guests, so we tried to virObjectUnlock
> a mutex which had been freed. This often led to a crash.
> 
> Signed-off-by: Daniel P. Berrange <berrange at redhat.com>
> ---
>  src/qemu/qemu_process.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)

ACK.

> 
> diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c
> index db95d6e..1b9eede 100644
> --- a/src/qemu/qemu_process.c
> +++ b/src/qemu/qemu_process.c
> @@ -4629,8 +4629,10 @@ qemuProcessAutoDestroy(virQEMUDriverPtr driver,
>  
>      if (!qemuDomainObjEndJob(driver, dom))
>          dom = NULL;
> -    if (dom && !dom->persistent)
> +    if (dom && !dom->persistent) {
>          qemuDomainRemoveInactive(driver, dom);
> +        dom = NULL;
> +    }
>      if (event)
>          qemuDomainEventQueue(driver, event);
>  
> 

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

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