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drm/amd/pm/smu11: Prevent division by zero

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commit 7ba88b5cccc1a99c1afb96e31e7eedac9907704c 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: 1e866f1fe5 ("drm/amd/pm: Prevent divide by zero")
Signed-off-by: Denis Arefev <arefev@swemel.ru>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit da7dc714a8f8e1c9fc33c57cd63583779a3bef71)
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Denis Arefev
2025-03-20 12:35:02 +03:00
committed by Greg Kroah-Hartman
parent bd4d90adbc
commit 63a1504001
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/amd/pm/swsmu/smu11/smu_v11_0.c
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@@ -1199,7 +1199,7 @@ int smu_v11_0_set_fan_speed_rpm(struct smu_context *smu,
uint32_t crystal_clock_freq = 2500;
uint32_t tach_period;
if (speed == 0)
if (!speed || speed > UINT_MAX/8)
return -EINVAL;
/*
* To prevent from possible overheat, some ASICs may have requirement