6.6-stable review patch. If anyone has any objections, please let me know.
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From: Alex Hung alex.hung@amd.com
[ Upstream commit 8e2734bf444767fed787305ccdcb36a2be5301a2 ]
[WHY & HOW] Make sure vmid0p72_idx, vnom0p8_idx and vmax0p9_idx calculation will never overflow and exceess array size.
This fixes 3 OVERRUN and 1 INTEGER_OVERFLOW issues reported by Coverity.
Reviewed-by: Harry Wentland harry.wentland@amd.com Acked-by: Tom Chung chiahsuan.chung@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/dc/dml/calcs/dcn_calcs.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/amd/display/dc/dml/calcs/dcn_calcs.c b/drivers/gpu/drm/amd/display/dc/dml/calcs/dcn_calcs.c index 50b0434354f8..c08169de3660 100644 --- a/drivers/gpu/drm/amd/display/dc/dml/calcs/dcn_calcs.c +++ b/drivers/gpu/drm/amd/display/dc/dml/calcs/dcn_calcs.c @@ -1453,10 +1453,9 @@ void dcn_bw_update_from_pplib_fclks( ASSERT(fclks->num_levels);
vmin0p65_idx = 0; - vmid0p72_idx = fclks->num_levels - - (fclks->num_levels > 2 ? 3 : (fclks->num_levels > 1 ? 2 : 1)); - vnom0p8_idx = fclks->num_levels - (fclks->num_levels > 1 ? 2 : 1); - vmax0p9_idx = fclks->num_levels - 1; + vmid0p72_idx = fclks->num_levels > 2 ? fclks->num_levels - 3 : 0; + vnom0p8_idx = fclks->num_levels > 1 ? fclks->num_levels - 2 : 0; + vmax0p9_idx = fclks->num_levels > 0 ? fclks->num_levels - 1 : 0;
dc->dcn_soc->fabric_and_dram_bandwidth_vmin0p65 = 32 * (fclks->data[vmin0p65_idx].clocks_in_khz / 1000.0) / 1000.0;