linux-kernel - [PATCH AUTOSEL 5.15 05/47] drm/amd/pm: fix the Out-of-bounds read warning

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Message-ID: <20240801003256.3937416-5-sashal@kernel.org>
Date: Wed, 31 Jul 2024 20:30:55 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Jesse Zhang <jesse.zhang@....com>,
	Jesse Zhang <Jesse.Zhang@....com>,
	Tim Huang <Tim.Huang@....com>,
	Alex Deucher <alexander.deucher@....com>,
	Sasha Levin <sashal@...nel.org>,
	kenneth.feng@....com,
	christian.koenig@....com,
	Xinhui.Pan@....com,
	airlied@...il.com,
	daniel@...ll.ch,
	samasth.norway.ananda@...cle.com,
	electrodeyt@...il.com,
	amd-gfx@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 5.15 05/47] drm/amd/pm: fix the Out-of-bounds read warning

From: Jesse Zhang <jesse.zhang@....com>

[ Upstream commit 12c6967428a099bbba9dfd247bb4322a984fcc0b ]

using index i - 1U may beyond element index
for mc_data[] when i = 0.

Signed-off-by: Jesse Zhang <Jesse.Zhang@....com>
Reviewed-by: Tim Huang <Tim.Huang@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 f503e61faa600..cc3b62f733941 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++;
-- 
2.43.0