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[ Upstream commite5f10d6385] Our variety of defined gpu commands have the actual command id field and possibly length and flags applied. We did start to apply the mask during initialization of the cmd descriptors but forgot to also apply it on comparisons. Fix comparisons in order to properly deny access with associated commands. v2: fix lri with correct mask (Chris) References:926abff21a("drm/i915/cmdparser: Ignore Length operands during command matching") Reported-by: Nicolai Stange <nstange@suse.de> Cc: stable@vger.kernel.org # v5.4+ Cc: Miroslav Benes <mbenes@suse.cz> Cc: Takashi Iwai <tiwai@suse.de> Cc: Tyler Hicks <tyhicks@canonical.com> Cc: Jon Bloomfield <jon.bloomfield@intel.com> Cc: Chris Wilson <chris.p.wilson@intel.com> Signed-off-by: Mika Kuoppala <mika.kuoppala@linux.intel.com> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Link: https://patchwork.freedesktop.org/patch/msgid/20200817195926.12671-1-mika.kuoppala@linux.intel.com (cherry picked from commit3b4efa148d) Signed-off-by: Jani Nikula <jani.nikula@intel.com> Signed-off-by: Sasha Levin <sashal@kernel.org>