hwmon: (dell-smm) Limit fan multiplier to avoid overflow

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[ Upstream commit 46c28bbbb1 ]

The fan nominal speed returned by SMM is limited to 16 bits, but the
driver allows the fan multiplier to be set via a module parameter.

Clamp the computed fan multiplier so that fan_nominal_speed *
i8k_fan_mult always fits into a signed 32-bit integer and refuse to
initialize the driver if the value is too large.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Fixes: 20bdeebc88 ("hwmon: (dell-smm) Introduce helper function for data init")
Signed-off-by: Denis Sergeev <denserg.edu@gmail.com>
Link: https://lore.kernel.org/r/20251209063706.49008-1-denserg.edu@gmail.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Denis Sergeev 2025-12-09 09:37:06 +03:00 • committed by Greg Kroah-Hartman

parent 5e4481ef39

commit e52b375b7d

1 changed files with 9 additions and 0 deletions

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drivers/hwmon/dell-smm-hwmon.c

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