This is a note to let you know that I've just added the patch titled
drm/amd/display: Check denominator pbn_div before used
to the 6.1-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-denominator-pbn_div-before-use.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit ea84ace9571d5e4721ba7f3331d421dc8004e6c7
Author: Alex Hung <alex.hung@xxxxxxx>
Date: Tue Jun 18 16:21:20 2024 -0600
drm/amd/display: Check denominator pbn_div before used
[ Upstream commit 116a678f3a9abc24f5c9d2525b7393d18d9eb58e ]
[WHAT & HOW]
A denominator cannot be 0, and is checked before used.
This fixes 1 DIVIDE_BY_ZERO issue reported by Coverity.
Reviewed-by: Harry Wentland <harry.wentland@xxxxxxx>
Signed-off-by: Jerry Zuo <jerry.zuo@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/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index 0be1a1149a3f..393e32259a77 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -6767,7 +6767,7 @@ static int dm_update_mst_vcpi_slots_for_dsc(struct drm_atomic_state *state,
}
}
- if (j == dc_state->stream_count)
+ if (j == dc_state->stream_count || pbn_div == 0)
continue;
slot_num = DIV_ROUND_UP(pbn, pbn_div);
