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drm/amd/pm: Prevent division by zero

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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: c52dcf4919 ("drm/amd/pp: Avoid divide-by-zero in fan_ctrl_set_fan_speed_rpm")
Signed-off-by: Denis Arefev <arefev@swemel.ru>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Denis Arefev 2025-03-21 14:08:15 +03:00 committed by Alex Deucher
parent 4e3d9508c0
commit 4b8c3c0d17
1 changed files with 2 additions and 2 deletions
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4
drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega10_thermal.c
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@ -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);