From 1322a7bc423b6fc3652c759cd158c6f96b9f79b8 Mon Sep 17 00:00:00 2001 From: Jesse Zhang Date: Mon, 23 Sep 2024 11:02:33 +0800 Subject: [PATCH] drm/amd/pm: fix the Out-of-bounds read warning stable inclusion from stable-v5.10.226 commit 38e32a0d837443c91c4b615a067b976cfb925376 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IARV5V CVE: CVE-2024-46731 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=38e32a0d837443c91c4b615a067b976cfb925376 -------------------------------- [ Upstream commit 12c6967428a099bbba9dfd247bb4322a984fcc0b ] using index i - 1U may beyond element index for mc_data[] when i = 0. Signed-off-by: Jesse Zhang Reviewed-by: Tim Huang Signed-off-by: Alex Deucher Signed-off-by: Sasha Levin Signed-off-by: Huang Xiaojia --- drivers/gpu/drm/amd/pm/powerplay/hwmgr/ppatomctrl.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/ppatomctrl.c b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/ppatomctrl.c index 01dc46dc9c8a..165af862d054 100644 --- a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/ppatomctrl.c +++ b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/ppatomctrl.c @@ -73,8 +73,9 @@ static int atomctrl_retrieve_ac_timing( j++; } else if ((table->mc_reg_address[i].uc_pre_reg_data & LOW_NIBBLE_MASK) == DATA_EQU_PREV) { - table->mc_reg_table_entry[num_ranges].mc_data[i] = - table->mc_reg_table_entry[num_ranges].mc_data[i-1]; + if (i) + table->mc_reg_table_entry[num_ranges].mc_data[i] = + table->mc_reg_table_entry[num_ranges].mc_data[i-1]; } } num_ranges++; -- Gitee