From: Jesse Zhang <jesse.zhang@xxxxxxx>
[ Upstream commit 12c6967428a099bbba9dfd247bb4322a984fcc0b ]
using index i - 1U may beyond element index
for mc_data[] when i = 0.
Signed-off-by: Jesse Zhang <Jesse.Zhang@xxxxxxx>
Reviewed-by: Tim Huang <Tim.Huang@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
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 b1b4c09c34671..b56298d9da98f 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
