This is a note to let you know that I've just added the patch titled
drm/amd/display: Check link_index before accessing dc->links[]
to the 6.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-amd-display-check-link_index-before-accessing-dc.patch
and it can be found in the queue-6.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 2949eea1c4129f0d659203997b3d1a9bbc43a673
Author: Alex Hung <alex.hung@xxxxxxx>
Date: Tue Apr 16 16:30:17 2024 -0600
drm/amd/display: Check link_index before accessing dc->links[]
[ Upstream commit 8aa2864044b9d13e95fe224f32e808afbf79ecdf ]
[WHY & HOW]
dc->links[] has max size of MAX_LINKS and NULL is return when trying to
access with out-of-bound index.
This fixes 3 OVERRUN and 1 RESOURCE_LEAK issues reported by Coverity.
Reviewed-by: Harry Wentland <harry.wentland@xxxxxxx>
Acked-by: Tom Chung <chiahsuan.chung@xxxxxxx>
Signed-off-by: Alex Hung <alex.hung@xxxxxxx>
Tested-by: Daniel Wheeler <daniel.wheeler@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link_exports.c b/drivers/gpu/drm/amd/display/dc/core/dc_link_exports.c
index c6c35037bdb8..dfdfe22d9e85 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link_exports.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_exports.c
@@ -37,6 +37,9 @@
#include "dce/dce_i2c.h"
struct dc_link *dc_get_link_at_index(struct dc *dc, uint32_t link_index)
{
+ if (link_index >= MAX_LINKS)
+ return NULL;
+
return dc->links[link_index];
}
