Re: [PATCH v3 8/9] drm/rockchip: gem: Don't alloc/free gem buf when dev_private is invalid

Sean Paul
2017-04-05T16:29:52Z

On Wed, Apr 05, 2017 at 04:29:26PM +0800, Jeffy Chen wrote:
> After unbinding drm, the userspace may still has a chance to access
> gem buf.
>
> Add a sanity check for a NULL dev_private to prevent that from
> happening.

I still don't understand how this is happening. You're saying that these hooks
can be called after rockchip_drm_unbind() has finished?

Sean

>
> Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>
> ---
>
> Changes in v3:
> Address Daniel Vetter <daniel@ffwll.ch>'s comments.
> Update commit message.
>
> Changes in v2: None
>
> drivers/gpu/drm/rockchip/rockchip_drm_gem.c | 8 ++++++++
> 1 file changed, 8 insertions(+)
>
> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_gem.c b/drivers/gpu/drm/rockchip/rockchip_drm_gem.c
> index df9e570..205a3dc 100644
> --- a/drivers/gpu/drm/rockchip/rockchip_drm_gem.c
> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_gem.c
> @@ -184,6 +184,9 @@ static int rockchip_gem_alloc_buf(struct rockchip_gem_object *rk_obj,
> struct drm_device *drm = obj->dev;
> struct rockchip_drm_private *private = drm->dev_private;
>
> + if (!private)
> + return -ENODEV;
> +
> if (private->domain)
> return rockchip_gem_alloc_iommu(rk_obj, alloc_kmap);
> else
> @@ -208,6 +211,11 @@ static void rockchip_gem_free_dma(struct rockchip_gem_object *rk_obj)
>
> static void rockchip_gem_free_buf(struct rockchip_gem_object *rk_obj)
> {
> + struct drm_device *drm = rk_obj->base.dev;
> +
> + if (!drm->dev_private)
> + return;
> +
> if (rk_obj->pages)
> rockchip_gem_free_iommu(rk_obj);
> else
> --
> 2.1.4
>

--
Sean Paul, Software Engineer, Google / Chromium OS