linux-kernel - [PATCH AUTOSEL 6.10 019/121] drm/amd/display: Skip updating link encoder for unknown eng

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Message-ID: <20240801000834.3930818-19-sashal@kernel.org>
Date: Wed, 31 Jul 2024 19:59:17 -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>,
	Tom Chung <chiahsuan.chung@....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,
	hamza.mahfooz@....com,
	lewis.huang@....com,
	mghaddar@....com,
	michael.strauss@....com,
	srinivasan.shanmugam@....com,
	Bhawanpreet.Lakha@....com,
	amd-gfx@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 6.10 019/121] drm/amd/display: Skip updating link encoder for unknown eng_id

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

[ Upstream commit efabdce3db9f3d306084c8946983f3d895810a6b ]

This prevents accessing to negative index of link_encoders array.

This fixes an OVERRUN issue reported by Coverity.

Reviewed-by: Rodrigo Siqueira <rodrigo.siqueira@....com>
Acked-by: Tom Chung <chiahsuan.chung@....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/link/link_factory.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/dc/link/link_factory.c b/drivers/gpu/drm/amd/display/dc/link/link_factory.c
index cf22b8f28ba6c..2c3f5d6622851 100644
--- a/drivers/gpu/drm/amd/display/dc/link/link_factory.c
+++ b/drivers/gpu/drm/amd/display/dc/link/link_factory.c
@@ -390,7 +390,7 @@ static void link_destruct(struct dc_link *link)
 		 * the dynamic assignment of link encoders to streams. Virtual links
 		 * are not assigned encoder resources on creation.
 		 */
-		if (link->link_id.id != CONNECTOR_ID_VIRTUAL) {
+		if (link->link_id.id != CONNECTOR_ID_VIRTUAL && link->eng_id != ENGINE_ID_UNKNOWN) {
 			link->dc->res_pool->link_encoders[link->eng_id - ENGINE_ID_DIGA] = NULL;
 			link->dc->res_pool->dig_link_enc_count--;
 		}
-- 
2.43.0