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amdgpu/pm: prevent array underflow in vega20_odn_edit_dpm_table()

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[ Upstream commit d27252b5706e51188aed7647126e44dcf9e940c1 ]

In the PP_OD_EDIT_VDDC_CURVE case the "input_index" variable is capped at
2 but not checked for negative values so it results in an out of bounds
read.  This value comes from the user via sysfs.

Fixes: d5bf265394 ("drm/amd/powerplay: added vega20 overdrive support V3")
Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Dan Carpenter 2022-11-15 15:56:57 +03:00 committed by Greg Kroah-Hartman
parent d39937f8de
commit 4d3dc0de9c
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/amd/powerplay/hwmgr/vega20_hwmgr.c
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@ -2894,7 +2894,8 @@ static int vega20_odn_edit_dpm_table(struct pp_hwmgr *hwmgr,
data->od8_settings.od8_settings_array;
OverDriveTable_t *od_table =
&(data->smc_state_table.overdrive_table);
int32_t input_index, input_clk, input_vol, i;
int32_t input_clk, input_vol, i;
uint32_t input_index;
int od8_id;
int ret;