| Message ID | 20250321110817.10274-1-arefev@swemel.ru (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | drm/amd/pm: Prevent division by zero | expand |
diff --git a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega10_thermal.c b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega10_thermal.c index 379012494da5..56423aedf3fa 100644 --- a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega10_thermal.c +++ b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega10_thermal.c @@ -307,10 +307,10 @@ int vega10_fan_ctrl_set_fan_speed_rpm(struct pp_hwmgr *hwmgr, uint32_t speed) int result = 0; if (hwmgr->thermal_controller.fanInfo.bNoFan || - speed == 0 || + (!speed || speed > UINT_MAX/8) || (speed < hwmgr->thermal_controller.fanInfo.ulMinRPM) || (speed > hwmgr->thermal_controller.fanInfo.ulMaxRPM)) - return -1; + return -EINVAL; if (PP_CAP(PHM_PlatformCaps_MicrocodeFanControl)) result = vega10_fan_ctrl_stop_smc_fan_control(hwmgr);
The user can set any speed value. If speed is greater than UINT_MAX/8, division by zero is possible. Found by Linux Verification Center (linuxtesting.org) with SVACE. Fixes: c52dcf49195d ("drm/amd/pp: Avoid divide-by-zero in fan_ctrl_set_fan_speed_rpm") Signed-off-by: Denis Arefev <arefev@swemel.ru> --- drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega10_thermal.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)