[PATCH AUTOSEL 6.1 50/61] drm/amd/display: Check denominator pbn_div before used

Sasha Levin
2024-08-01T00:31:13Z

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

[ 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@amd.com>
Signed-off-by: Jerry Zuo <jerry.zuo@amd.com>
Signed-off-by: Alex Hung <alex.hung@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

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 2c6caddf1de34..b7d2fa77d828b 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -6765,7 +6765,7 @@ 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);
--
2.43.0