From: jsg <jsg@openbsd.org>
Date: Mon, 9 Sep 2024 08:39:21 +0000 (+0000)
Subject: drm/amd/pm: fix the Out-of-bounds read warning
X-Git-Url: http://artulab.com/gitweb/?a=commitdiff_plain;h=75dce59b456df386f1a1be09a4261978c0cc0187;p=openbsd

drm/amd/pm: fix the Out-of-bounds read warning

From Jesse Zhang
f1e261ced9bcad772a45a2fcdf413c3490e87299 in linux-6.6.y/6.6.50
12c6967428a099bbba9dfd247bb4322a984fcc0b in mainline linux
---

diff --git a/sys/dev/pci/drm/amd/pm/powerplay/hwmgr/ppatomctrl.c b/sys/dev/pci/drm/amd/pm/powerplay/hwmgr/ppatomctrl.c
index f503e61faa6..cc3b62f7339 100644
--- a/sys/dev/pci/drm/amd/pm/powerplay/hwmgr/ppatomctrl.c
+++ b/sys/dev/pci/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++;