提交 f8e6bfc2 编写于 作者: A Alex Deucher

drm/radeon: fix possible segfault when parsing pm tables

If we have a empty power table, bail early and allocate
the default power state.

Should fix:
https://bugs.freedesktop.org/show_bug.cgi?id=63865Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
上级 beb71fc6
......@@ -2028,6 +2028,8 @@ static int radeon_atombios_parse_power_table_1_3(struct radeon_device *rdev)
num_modes = power_info->info.ucNumOfPowerModeEntries;
if (num_modes > ATOM_MAX_NUMBEROF_POWER_BLOCK)
num_modes = ATOM_MAX_NUMBEROF_POWER_BLOCK;
if (num_modes == 0)
return state_index;
rdev->pm.power_state = kzalloc(sizeof(struct radeon_power_state) * num_modes, GFP_KERNEL);
if (!rdev->pm.power_state)
return state_index;
......@@ -2432,6 +2434,8 @@ static int radeon_atombios_parse_power_table_4_5(struct radeon_device *rdev)
power_info = (union power_info *)(mode_info->atom_context->bios + data_offset);
radeon_atombios_add_pplib_thermal_controller(rdev, &power_info->pplib.sThermalController);
if (power_info->pplib.ucNumStates == 0)
return state_index;
rdev->pm.power_state = kzalloc(sizeof(struct radeon_power_state) *
power_info->pplib.ucNumStates, GFP_KERNEL);
if (!rdev->pm.power_state)
......@@ -2530,6 +2534,8 @@ static int radeon_atombios_parse_power_table_6(struct radeon_device *rdev)
non_clock_info_array = (struct _NonClockInfoArray *)
(mode_info->atom_context->bios + data_offset +
le16_to_cpu(power_info->pplib.usNonClockInfoArrayOffset));
if (state_array->ucNumEntries == 0)
return state_index;
rdev->pm.power_state = kzalloc(sizeof(struct radeon_power_state) *
state_array->ucNumEntries, GFP_KERNEL);
if (!rdev->pm.power_state)
......@@ -2620,7 +2626,9 @@ void radeon_atombios_get_power_modes(struct radeon_device *rdev)
default:
break;
}
} else {
}
if (state_index == 0) {
rdev->pm.power_state = kzalloc(sizeof(struct radeon_power_state), GFP_KERNEL);
if (rdev->pm.power_state) {
rdev->pm.power_state[0].clock_info =
......
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