[PATCH] drm/mediatek: Check GEM buffer size

[Hubert Mazur]

On Mon, Sep 25, 2023 at 11:40 AM CK Hu (胡俊光) <ck.hu at mediatek.com> wrote:

> Hi, Hubert:
>
> On Mon, 2023-09-25 at 09:22 +0000, Hubert Mazur wrote:
> >
> > External email : Please do not click links or open attachments until
> > you have verified the sender or the content.
> >  The buffer size is derived from parameters supplied by the
> > userspace.
> > Having the size equal 0 causes allocation failure leading to kernel
> > panic.
>
> The size is calculated by width and height, and drm_mode_create_dumb()
> has checked the width and height, so the size would not be 0. So this
> patch is redundant.
>

Ah, you are right, I had an inner checkout which required this fix.
Let's abandon this patch.
Thanks for the review!
Regards,
Hubert

Regards,
> CK
>
> >
> > Fix this by checking if size equals 0.
> >
> > Fixes: 119f5173628a ("drm/mediatek: Add DRM Driver for Mediatek SoC
> > MT8173.")
> >
> > Signed-off-by: Hubert Mazur <hmazur at chromium.org>
> > ---
> >  drivers/gpu/drm/mediatek/mtk_drm_gem.c | 5 +++++
> >  1 file changed, 5 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/mediatek/mtk_drm_gem.c
> > b/drivers/gpu/drm/mediatek/mtk_drm_gem.c
> > index 9f364df52478..3b985b99d5c6 100644
> > --- a/drivers/gpu/drm/mediatek/mtk_drm_gem.c
> > +++ b/drivers/gpu/drm/mediatek/mtk_drm_gem.c
> > @@ -62,6 +62,11 @@ struct mtk_drm_gem_obj *mtk_drm_gem_create(struct
> > drm_device *dev,
> >       struct drm_gem_object *obj;
> >       int ret;
> >
> > +     if (size == 0) {
> > +             DRM_ERROR("Invalid allocation size: %zu", size);
> > +             return ERR_PTR(-EINVAL);
> > +     }
> > +
> >       mtk_gem = mtk_drm_gem_init(dev, size);
> >       if (IS_ERR(mtk_gem))
> >               return ERR_CAST(mtk_gem);
> > --
> > 2.42.0.515.g380fc7ccd1-goog
>
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