From: Alex Hung alex.hung@amd.com

mainline inclusion from mainline-v6.11-rc7 commit 116a678f3a9abc24f5c9d2525b7393d18d9eb58e category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IARWXX CVE: CVE-2024-46773

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...

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[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: Xia Fukun xiafukun@huawei.com --- 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 94059aef762b..2c7ba6e4fd1b 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c @@ -6934,7 +6934,7 @@ 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);