drm/i915: Large page offsets for pread/pwrite
commit ab0d6a141843e0b4b2709dfd37b53468b5452c3a upstream. Handle integer overflow when computing the sub-page length for shmem backed pread/pwrite. Reported-by: NTvrtko Ursulin <tvrtko.ursulin@intel.com> Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Cc: stable@vger.kernel.org Reviewed-by: NTvrtko Ursulin <tvrtko.ursulin@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20181012140228.29783-1-chris@chris-wilson.co.uk (cherry picked from commit a5e856a5348f6cd50889d125c40bbeec7328e466) Signed-off-by: NRodrigo Vivi <rodrigo.vivi@intel.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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