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hwmon: (adt7470) Prevent divide by zero in adt7470_fan_write() 

The "val" variable is controlled by the user and comes from
hwmon_attr_store().  The FAN_RPM_TO_PERIOD() macro divides by "val"
so a zero will crash the system.  Check for that and return -EINVAL.
Negatives are also invalid so return -EINVAL for those too.

Fixes: fc958a61ff ("hwmon: (adt7470) Convert to devm_hwmon_device_register_with_info API")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Dan Carpenter 2022-01-21 14:55:43 +03:00 committed by Guenter Roeck
parent f1e75e0d6a
commit c1ec0cabc3
1 changed files with 3 additions and 0 deletions
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3
drivers/hwmon/adt7470.c
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@ -662,6 +662,9 @@ static int adt7470_fan_write(struct device *dev, u32 attr, int channel, long val
struct adt7470_data *data = dev_get_drvdata(dev);
int err;
if (val <= 0)
return -EINVAL;
val = FAN_RPM_TO_PERIOD(val);
val = clamp_val(val, 1, 65534);