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Commit 6b9f9b99 authored by Denis Arefev's avatar Denis Arefev Committed by Greg Kroah-Hartman
Browse files

drm/amd/pm: Prevent division by zero 



[ Upstream commit 4e3d9508c056d7e0a56b58d5c81253e2a0d22b6c ]

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: 031db090 ("drm/amd/powerplay/vega20: enable fan RPM and pwm settings V2")
Signed-off-by: default avatarDenis Arefev <arefev@swemel.ru>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
parent ce5af106

drivers/gpu/drm/amd/powerplay/hwmgr/vega20_thermal.c

+1 −1
Original line number Diff line number Diff line
@@ -189,7 +189,7 @@ 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)) {