[libvirt] [PATCH 6/8] qemu: avoid null deref on low memory

[Wen Congyang]

At 2011-7-2 7:36, Eric Blake write:
> Detected by Coverity.  qemuDomainEventQueue requires a non-NULL
> pointer; most callers silently drop the event if we encountered
> and OOM situation trying to create the event.
>
> * src/qemu/qemu_migration.c (qemuMigrationFinish): Check for OOM.
> ---
>   src/qemu/qemu_migration.c |    3 ++-
>   1 files changed, 2 insertions(+), 1 deletions(-)
>
> diff --git a/src/qemu/qemu_migration.c b/src/qemu/qemu_migration.c
> index 800b714..d7b27a0 100644
> --- a/src/qemu/qemu_migration.c
> +++ b/src/qemu/qemu_migration.c
> @@ -2552,7 +2552,8 @@ qemuMigrationFinish(struct qemud_driver *driver,
>                                            VIR_DOMAIN_EVENT_RESUMED_MIGRATED);
>           if (virDomainObjGetState(vm, NULL) == VIR_DOMAIN_PAUSED) {
>               virDomainObjSetState(vm, VIR_DOMAIN_PAUSED, VIR_DOMAIN_PAUSED_USER);
> -            qemuDomainEventQueue(driver, event);
> +            if (event)
> +                qemuDomainEventQueue(driver, event);
>               event = virDomainEventNewFromObj(vm,
>                                                VIR_DOMAIN_EVENT_SUSPENDED,
>                                                VIR_DOMAIN_EVENT_SUSPENDED_PAUSED);
ACK