drm/i915: Sanity check pread/pwrite
Move the access control up from the fast paths, which are no longer universally taken first, up into the caller. This then duplicates some sanity checking along the slow paths, but is much simpler. Tracked as CVE-2010-2962. Reported-by: NKees Cook <kees@ubuntu.com> Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk> Cc: stable@kernel.org
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