[PATCH libdrm] drm/atomic: Refuse to add invalid objects to requests

[Daniel Vetter]

On Wed, Mar 07, 2018 at 12:42:15PM +0000, Daniel Stone wrote:
> Object and property IDs cannot be zero. Prevent them from being added to
> the request stream at all, rather than breaking at commit time.
> 
> Signed-off-by: Daniel Stone <daniels at collabora.com>
> ---
>  xf86drmMode.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/xf86drmMode.c b/xf86drmMode.c
> index 15957ffc..bd59ef25 100644
> --- a/xf86drmMode.c
> +++ b/xf86drmMode.c
> @@ -1313,6 +1313,9 @@ int drmModeAtomicAddProperty(drmModeAtomicReqPtr req,
>  	if (!req)
>  		return -EINVAL;
>  
> +	if (object_id == 0 || property_id == 0)
> +		return -EINVAL;

Reviewed-by: Daniel Vetter <daniel.vetter at ffwll.ch>

... and gives us a perfect spot to gdb into a backtrace and figure out wtf
is going on with drm_hwc :-)
-Daniel

> +
>  	if (req->cursor >= req->size_items) {
>  		drmModeAtomicReqItemPtr new;
>  
> -- 
> 2.14.3
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch