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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: 031db09017 ("drm/amd/powerplay/vega20: enable fan RPM and pwm settings V2")
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 13:52:33 +03:00 committed by Alex Deucher
parent 7d641c2b83
commit 4e3d9508c0
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega20_thermal.c
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@ -191,7 +191,7 @@ int vega20_fan_ctrl_set_fan_speed_rpm(struct pp_hwmgr *hwmgr, uint32_t speed)
uint32_t tach_period, crystal_clock_freq;
int result = 0;
if (!speed)
if (!speed || speed > UINT_MAX/8)
return -EINVAL;
if (PP_CAP(PHM_PlatformCaps_MicrocodeFanControl)) {