hwmon: (f71882fg) prevent possible division by zero

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[ Upstream commit 0babf89c9c ]

In the unlikely event that something goes wrong with the device and
its registers, the fan_from_reg() function may return 0. This value
will cause a division-by-zero error in the show_pwm() function.

To prevent this, test the value of
fan_from_reg(data->fan_full_speed[nr]) against 0 before performing
the division. If the division-by-zero error is avoided, assign 0 to
the val variable.

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

Fixes: df9ec2dae0 ("hwmon: (f71882fg) Reorder symbols to get rid of a few forward declarations")
Signed-off-by: Nikita Zhandarovich <n.zhandarovich@fintech.ru>
Link: https://lore.kernel.org/r/20230510143537.145060-1-n.zhandarovich@fintech.ru
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Nikita Zhandarovich 2023-05-10 07:35:37 -07:00 • committed by Greg Kroah-Hartman

parent 08cc7cd2c2

commit 280e58d8b0

1 changed files with 5 additions and 2 deletions

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drivers/hwmon/f71882fg.c

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