This is a note to let you know that I've just added the patch titled
drm/amd/display: Fix Coverity INTEGER_OVERFLOW within decide_fallback_link_setting_max_bw_policy
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-fix-coverity-integer_overflow-within.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 2e2d0e86f3514371d0f3c3d2ec9fea979f7c74cf
Author: Hersen Wu <hersenxs.wu@xxxxxxx>
Date: Fri Apr 26 12:13:59 2024 -0400
drm/amd/display: Fix Coverity INTEGER_OVERFLOW within decide_fallback_link_setting_max_bw_policy
[ Upstream commit 83c0c8361347cf43937348e8ca0a487679c003ae ]
[Why]
For addtion (uint8_t) variable + constant 1,
coverity generates message below:
Truncation due to cast operation on "cur_idx + 1" from
32 to 8 bits.
Then Coverity assume result is 32 bits value be saved into
8 bits variable. When result is used as index to access
array, Coverity suspects index invalid.
[How]
Change varaible type to uint32_t.
Reviewed-by: Alex Hung <alex.hung@xxxxxxx>
Reviewed-by: Harry Wentland <harry.wentland@xxxxxxx>
Acked-by: Tom Chung <chiahsuan.chung@xxxxxxx>
Signed-off-by: Hersen Wu <hersenxs.wu@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/link/protocols/link_dp_capability.c b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c
index d487dfcd219b..b26faed3bb20 100644
--- a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c
+++ b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c
@@ -534,7 +534,7 @@ static bool decide_fallback_link_setting_max_bw_policy(
struct dc_link_settings *cur,
enum link_training_result training_result)
{
- uint8_t cur_idx = 0, next_idx;
+ uint32_t cur_idx = 0, next_idx;
bool found = false;
if (training_result == LINK_TRAINING_ABORT)
