Re: [Qemu-devel] [PATCH for-2.1 2/2] qdev: Fix crash when using non-device class name on -global

[Eric Blake]

On 07/03/2014 01:45 PM, Eduardo Habkost wrote:
> This fixes the following crash:
> 
>     $ qemu-system-x86_64 -global container.xxx=y
>     hw/core/qdev-properties-system.c:399:qdev_add_one_global: Object 
> 0x7f7eff234100 is not an instance of type device
>     Aborted (core dumped)
> 
> New behavior will be to just warn, just like when non-existing clas

s/clas/class/

> names are used:
> 
>     $ qemu-system-x86_64 -global container.xxx=y
>     qemu-system-x86_64: Warning: "-global container.xxx=y" not used
> 
> Signed-off-by: Eduardo Habkost <address@hidden>
> ---
>  hw/core/qdev-properties-system.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/hw/core/qdev-properties-system.c 
> b/hw/core/qdev-properties-system.c
> index 8e140af..ae0900f 100644
> --- a/hw/core/qdev-properties-system.c
> +++ b/hw/core/qdev-properties-system.c
> @@ -394,7 +394,8 @@ static int qdev_add_one_global(QemuOpts *opts, void 
> *opaque)
>      g->driver   = qemu_opt_get(opts, "driver");
>      g->property = qemu_opt_get(opts, "property");
>      g->value    = qemu_opt_get(opts, "value");
> -    oc = object_class_by_name(g->driver);
> +    oc = object_class_dynamic_cast(object_class_by_name(g->driver),
> +                                   TYPE_DEVICE);
>      if (oc) {
>          DeviceClass *dc = DEVICE_CLASS(oc);

I'm not an expert on the type system, but this one looks simple enough
that I don't mind:

Reviewed-by: Eric Blake <address@hidden>

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

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