linux-kernel - [PATCH AUTOSEL 6.1 39/61] drm/amd/display: added NULL check at start of dc_validate

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Message-ID: <20240801002803.3935985-39-sashal@kernel.org>
Date: Wed, 31 Jul 2024 20:25:57 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: winstang <winstang@....com>,
	Alvin Lee <alvin.lee2@....com>,
	Zaeem Mohamed <zaeem.mohamed@....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,
	wenjing.liu@....com,
	jun.lei@....com,
	alex.hung@....com,
	hamza.mahfooz@....com,
	george.shen@....com,
	dillon.varone@....com,
	amd-gfx@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 6.1 39/61] drm/amd/display: added NULL check at start of dc_validate_stream

From: winstang <winstang@....com>

[ Upstream commit 26c56049cc4f1705b498df013949427692a4b0d5 ]

[Why]
prevent invalid memory access

[How]
check if dc and stream are NULL

Co-authored-by: winstang <winstang@....com>
Reviewed-by: Alvin Lee <alvin.lee2@....com>
Acked-by: Zaeem Mohamed <zaeem.mohamed@....com>
Signed-off-by: winstang <winstang@....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_resource.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_resource.c b/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
index 83898e46bcadf..29400db42bb2d 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
@@ -3629,6 +3629,9 @@ void resource_build_bit_depth_reduction_params(struct dc_stream_state *stream,
 
 enum dc_status dc_validate_stream(struct dc *dc, struct dc_stream_state *stream)
 {
+	if (dc == NULL || stream == NULL)
+		return DC_ERROR_UNEXPECTED;
+
 	struct dc_link *link = stream->link;
 	struct timing_generator *tg = dc->res_pool->timing_generators[0];
 	enum dc_status res = DC_OK;
-- 
2.43.0