[PATCH] drm/compat: Clear bounce structures

[Maxime Ripard]

On Mon, Feb 22, 2021 at 11:06:43AM +0100, Daniel Vetter wrote:
> Some of them have gaps, or fields we don't clear. Native ioctl code
> does full copies plus zero-extends on size mismatch, so nothing can
> leak. But compat is more hand-rolled so need to be careful.
> 
> None of these matter for performance, so just memset.
> 
> Also I didn't fix up the CONFIG_DRM_LEGACY or CONFIG_DRM_AGP ioctl, those
> are security holes anyway.
> 
> Reported-by: syzbot+620cf21140fc7e772a5d at syzkaller.appspotmail.com # vblank ioctl
> Cc: syzbot+620cf21140fc7e772a5d at syzkaller.appspotmail.com
> Cc: stable at vger.kernel.org
> Signed-off-by: Daniel Vetter <daniel.vetter at intel.com>

Acked-by: Maxime Ripard <mripard at kernel.org>

Maxime
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