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| author | Denis Arefev <arefev@swemel.ru> | 2025-03-21 14:08:16 +0300 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2025-03-26 17:41:43 -0400 |
| commit | 7c246a05df51c52fe0852ce56ba10c41e6ed1f39 (patch) | |
| tree | 5a413cc5b032134d53bec0470dcb150071b7ef5e /drivers/gpu/drm/amd | |
| parent | 4b8c3c0d17c07f301011e2908fecd2ebdcfe3d1c (diff) | |
| download | linux-7c246a05df51c52fe0852ce56ba10c41e6ed1f39.tar.gz linux-7c246a05df51c52fe0852ce56ba10c41e6ed1f39.tar.bz2 linux-7c246a05df51c52fe0852ce56ba10c41e6ed1f39.zip | |
drm/amd/pm: Prevent division by zero
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>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Diffstat (limited to 'drivers/gpu/drm/amd')
| -rw-r--r-- | drivers/gpu/drm/amd/pm/powerplay/hwmgr/smu7_thermal.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/smu7_thermal.c b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/smu7_thermal.c index a8fc0fa44db6..ba5c1237fcfe 100644 --- a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/smu7_thermal.c +++ b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/smu7_thermal.c @@ -267,10 +267,10 @@ int smu7_fan_ctrl_set_fan_speed_rpm(struct pp_hwmgr *hwmgr, uint32_t speed) if (hwmgr->thermal_controller.fanInfo.bNoFan || (hwmgr->thermal_controller.fanInfo. ucTachometerPulsesPerRevolution == 0) || - speed == 0 || + (!speed || speed > UINT_MAX/8) || (speed < hwmgr->thermal_controller.fanInfo.ulMinRPM) || (speed > hwmgr->thermal_controller.fanInfo.ulMaxRPM)) - return 0; + return -EINVAL; if (PP_CAP(PHM_PlatformCaps_MicrocodeFanControl)) smu7_fan_ctrl_stop_smc_fan_control(hwmgr); |