linux-kernel - [PATCH AUTOSEL 5.15 30/31] drm/amd/display: Check null pointer before dereferencing se

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Message-ID: <20241004182854.3674661-30-sashal@kernel.org>
Date: Fri,  4 Oct 2024 14:28:38 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Alex Hung <alex.hung@....com>,
	Rodrigo Siqueira <rodrigo.siqueira@....com>,
	Daniel Wheeler <daniel.wheeler@....com>,
	Alex Deucher <alexander.deucher@....com>,
	Sasha Levin <sashal@...nel.org>,
	harry.wentland@....com,
	sunpeng.li@....com,
	Rodrigo.Siqueira@....com,
	christian.koenig@....com,
	Xinhui.Pan@....com,
	airlied@...il.com,
	daniel@...ll.ch,
	alvin.lee2@....com,
	wenjing.liu@....com,
	sungjoon.kim@....com,
	nicholas.kazlauskas@....com,
	dillon.varone@....com,
	aurabindo.pillai@....com,
	chiawen.huang@....com,
	amd-gfx@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 5.15 30/31] drm/amd/display: Check null pointer before dereferencing se

From: Alex Hung <alex.hung@....com>

[ Upstream commit ff599ef6970ee000fa5bc38d02fa5ff5f3fc7575 ]

[WHAT & HOW]
se is null checked previously in the same function, indicating
it might be null; therefore, it must be checked when used again.

This fixes 1 FORWARD_NULL issue reported by Coverity.

Acked-by: Alex Hung <alex.hung@....com>
Reviewed-by: Rodrigo Siqueira <rodrigo.siqueira@....com>
Signed-off-by: Alex Hung <alex.hung@....com>
Tested-by: Daniel Wheeler <daniel.wheeler@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/amd/display/dc/core/dc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c b/drivers/gpu/drm/amd/display/dc/core/dc.c
index 12e4beca5e840..72b8065ae082b 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
@@ -1464,7 +1464,7 @@ bool dc_validate_seamless_boot_timing(const struct dc *dc,
 		if (crtc_timing->pix_clk_100hz != pix_clk_100hz)
 			return false;
 
-		if (!se->funcs->dp_get_pixel_format)
+		if (!se || !se->funcs->dp_get_pixel_format)
 			return false;
 
 		if (!se->funcs->dp_get_pixel_format(
-- 
2.43.0