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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: c05d1c4015 ("drm/amd/swsmu: add aldebaran smu13 ip support (v3)")
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 13:52:31 +03:00
committed by Alex Deucher
parent cf05922d63
commit f23e9116eb
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0.c
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@@ -1226,7 +1226,7 @@ int smu_v13_0_set_fan_speed_rpm(struct smu_context *smu,
uint32_t tach_period;
int ret;
if (!speed)
if (!speed || speed > UINT_MAX/8)
return -EINVAL;
ret = smu_v13_0_auto_fan_control(smu, 0);