From 5454eec7d94e664e5b0b78f7b51a54a5eb4a9971 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jos=C3=A9=20Exp=C3=B3sito?= <jose.exposito89@gmail.com>
Date: Sun, 26 Dec 2021 12:16:14 +0100
Subject: drm/amd/display: fix dereference before NULL check
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Git-commit: f28cad86ada1a7345d7bbd379bef5a8babfa791b
Patch-mainline: v5.17-rc1
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225

The "plane_state" pointer was access before checking if it was NULL.

Avoid a possible NULL pointer dereference by accessing the plane
address after the check.

Addresses-Coverity-ID: 1493892 ("Dereference before null check")
Fixes: 3f68c01be9a22 ("drm/amd/display: add cyan_skillfish display support")
Signed-off-by: José Expósito <jose.exposito89@gmail.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
 drivers/gpu/drm/amd/display/dc/dcn201/dcn201_hwseq.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dcn201/dcn201_hwseq.c b/drivers/gpu/drm/amd/display/dc/dcn201/dcn201_hwseq.c
index cfd09b3f705e..fe22530242d2 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn201/dcn201_hwseq.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn201/dcn201_hwseq.c
@@ -134,11 +134,12 @@ void dcn201_update_plane_addr(const struct dc *dc, struct pipe_ctx *pipe_ctx)
 	PHYSICAL_ADDRESS_LOC addr;
 	struct dc_plane_state *plane_state = pipe_ctx->plane_state;
 	struct dce_hwseq *hws = dc->hwseq;
-	struct dc_plane_address uma = plane_state->address;
+	struct dc_plane_address uma;
 
 	if (plane_state == NULL)
 		return;
 
+	uma = plane_state->address;
 	addr_patched = patch_address_for_sbs_tb_stereo(pipe_ctx, &addr);
 
 	plane_address_in_gpu_space_to_uma(hws, &uma);
-- 
2.38.1