6.6-stable review patch. If anyone has any objections, please let me know.
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From: Denis Arefev arefev@swemel.ru
commit 4e3d9508c056d7e0a56b58d5c81253e2a0d22b6c upstream.
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: 031db09017da ("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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega20_thermal.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega20_thermal.c +++ b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega20_thermal.c @@ -191,7 +191,7 @@ int vega20_fan_ctrl_set_fan_speed_rpm(st 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)) {