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

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[ Upstream commit 12c6967428a099bbba9dfd247bb4322a984fcc0b ]

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

Signed-off-by: Jesse Zhang <Jesse.Zhang@amd.com>
Reviewed-by: Tim Huang <Tim.Huang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jesse Zhang
2024-04-30 10:29:08 +08:00
committed by Greg Kroah-Hartman
parent d592768c17
commit 38e32a0d83
1 changed files with 3 additions and 2 deletions
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5
drivers/gpu/drm/amd/pm/powerplay/hwmgr/ppatomctrl.c
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@@ -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++;