[Intel-gfx] [PATCH] drm/i915: Sanity check incoming ioctl data for a NULL pointer

[Chris Wilson]

On Sun, Mar 17, 2013 at 08:50:03PM +0100, Daniel Vetter wrote:
> On Sat, Mar 16, 2013 at 11:19 AM, Chris Wilson <chris at chris-wilson.co.uk> wrote:
> > If *userspace* doesn't request either IOC_IN | IOC_OUT in their ioctl
> > command (which are seperate from the ioctl number), then kdata is set to
> > NULL.
> 
> Doesn't that mean that we need these checks everywhere? Or at least a
> fixup in drm core proper?

That's my conclusion. We either add a flag to ask drm_ioctl to prevent
passing NULL pointers (as the existing behaviour may be useful
somewhere, and I have not checked all callees) or saturate our callbacks
with NULL checks.
-Chris
-- 
Chris Wilson, Intel Open Source Technology Centre