From: Alex Hung alex.hung@amd.com

stable inclusion from stable-v6.11.3 commit 7f8e93b862aba08d540f1e9e03e0ceb4d0cfd5fb category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IAYRC8 CVE: CVE-2024-49899

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...

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[ Upstream commit b995c0a6de6c74656a0c39cd57a0626351b13e3c ]

[WHAT & HOW] Variables used as denominators and maybe not assigned to other values, should not be 0. Change their default to 1 so they are never 0.

This fixes 10 DIVIDE_BY_ZERO issues 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 Conflicts: drivers/gpu/drm/amd/display/dc/dml2/dml21/src/dml2_core/dml2_core_shared.c [Context conflicts: no dml2_core_shared.c file in current version, introduced in higher version] Signed-off-by: dinglongwei dinglongwei1@huawei.com --- .../gpu/drm/amd/display/dc/dml/dcn20/display_rq_dlg_calc_20.c | 2 +- drivers/gpu/drm/amd/display/dc/dml/dml1_display_rq_dlg_calc.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dml/dcn20/display_rq_dlg_calc_20.c b/drivers/gpu/drm/amd/display/dc/dml/dcn20/display_rq_dlg_calc_20.c index 799bae229e67..0c5186f01c45 100644 --- a/drivers/gpu/drm/amd/display/dc/dml/dcn20/display_rq_dlg_calc_20.c +++ b/drivers/gpu/drm/amd/display/dc/dml/dcn20/display_rq_dlg_calc_20.c @@ -78,7 +78,7 @@ static void calculate_ttu_cursor(struct display_mode_lib *mode_lib,

static unsigned int get_bytes_per_element(enum source_format_class source_format, bool is_chroma) { - unsigned int ret_val = 0; + unsigned int ret_val = 1;

if (source_format == dm_444_16) { if (!is_chroma) diff --git a/drivers/gpu/drm/amd/display/dc/dml/dml1_display_rq_dlg_calc.c b/drivers/gpu/drm/amd/display/dc/dml/dml1_display_rq_dlg_calc.c index 414da64f5734..74fe5e6bb09d 100644 --- a/drivers/gpu/drm/amd/display/dc/dml/dml1_display_rq_dlg_calc.c +++ b/drivers/gpu/drm/amd/display/dc/dml/dml1_display_rq_dlg_calc.c @@ -39,7 +39,7 @@

static unsigned int get_bytes_per_element(enum source_format_class source_format, bool is_chroma) { - unsigned int ret_val = 0; + unsigned int ret_val = 1;

if (source_format == dm_444_16) { if (!is_chroma)