[PATCH 5.15 185/484] drm/amd/display: Check for NULL pointer

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5.15-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Sung Joon Kim <sungjoon.kim@xxxxxxx>

commit 4ab68e168ae1695f7c04fae98930740aaf7c50fa upstream.

[why & how]
Need to make sure plane_state is initialized
before accessing its members.

Cc: Mario Limonciello <mario.limonciello@xxxxxxx>
Cc: Alex Deucher <alexander.deucher@xxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Reviewed-by: Xi (Alex) Liu <xi.liu@xxxxxxx>
Signed-off-by: Sung Joon Kim <sungjoon.kim@xxxxxxx>
Signed-off-by: Aurabindo Pillai <aurabindo.pillai@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
(cherry picked from commit 295d91cbc700651782a60572f83c24861607b648)
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/gpu/drm/amd/display/dc/core/dc_surface.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/amd/display/dc/core/dc_surface.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_surface.c
@@ -154,7 +154,8 @@ const struct dc_plane_status *dc_plane_g
 		if (pipe_ctx->plane_state != plane_state)
 			continue;
 
-		pipe_ctx->plane_state->status.is_flip_pending = false;
+		if (pipe_ctx->plane_state)
+			pipe_ctx->plane_state->status.is_flip_pending = false;
 
 		break;
 	}






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