Patch "drm/amd/display: Check link_index before accessing dc->links[]" has been added to the 6.10-stable tree

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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];
 }
 




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