[PATCH 1/2] drm/amdgpu: fix UBSAN warning in kv_dpm.c

[Mario Limonciello]

On 6/14/2024 13:33, Alex Deucher wrote:
> Adds bounds check for sumo_vid_mapping_entry.
> 
> Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/3392
> Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
Reviewed-by: Mario Limonciello <mario.limonciello at amd.com>
> ---
>   drivers/gpu/drm/amd/pm/legacy-dpm/kv_dpm.c | 2 ++
>   1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/gpu/drm/amd/pm/legacy-dpm/kv_dpm.c b/drivers/gpu/drm/amd/pm/legacy-dpm/kv_dpm.c
> index 6bb42d04b247..e8b6989a40f3 100644
> --- a/drivers/gpu/drm/amd/pm/legacy-dpm/kv_dpm.c
> +++ b/drivers/gpu/drm/amd/pm/legacy-dpm/kv_dpm.c
> @@ -164,6 +164,8 @@ static void sumo_construct_vid_mapping_table(struct amdgpu_device *adev,
>   
>   	for (i = 0; i < SUMO_MAX_HARDWARE_POWERLEVELS; i++) {
>   		if (table[i].ulSupportedSCLK != 0) {
> +			if (table[i].usVoltageIndex >= SUMO_MAX_NUMBER_VOLTAGES)
> +				continue;
>   			vid_mapping_table->entries[table[i].usVoltageIndex].vid_7bit =
>   				table[i].usVoltageID;
>   			vid_mapping_table->entries[table[i].usVoltageIndex].vid_2bit =