drm/amd/display: Check for NULL pointer
commit 4ab68e168ae1695f7c04fae98930740aaf7c50fa upstream. [why & how] Need to make sure plane_state is initialized before accessing its members. Cc: Mario Limonciello <mario.limonciello@amd.com> Cc: Alex Deucher <alexander.deucher@amd.com> Cc: stable@vger.kernel.org Reviewed-by:Xi (Alex) Liu <xi.liu@amd.com> Signed-off-by:
Sung Joon Kim <sungjoon.kim@amd.com> Signed-off-by:
Aurabindo Pillai <aurabindo.pillai@amd.com> Signed-off-by:
Alex Deucher <alexander.deucher@amd.com> (cherry picked from commit 295d91cbc700651782a60572f83c24861607b648) Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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