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hwmon: (adc128d818) Fix underflows seen when writing limit attributes

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[ Upstream commit 8cad724c8537fe3e0da8004646abc00290adae40 ]

DIV_ROUND_CLOSEST() after kstrtol() results in an underflow if a large
negative number such as -9223372036854775808 is provided by the user.
Fix it by reordering clamp_val() and DIV_ROUND_CLOSEST() operations.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Guenter Roeck
2024-07-06 23:43:04 -07:00
committed by Greg Kroah-Hartman
parent 4eb4085c13
commit 05419d0056
1 changed files with 2 additions and 2 deletions
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4
drivers/hwmon/adc128d818.c
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@@ -184,7 +184,7 @@ static ssize_t adc128_set_in(struct device *dev, struct device_attribute *attr,
mutex_lock(&data->update_lock);
/* 10 mV LSB on limit registers */
regval = clamp_val(DIV_ROUND_CLOSEST(val, 10), 0, 255);
regval = DIV_ROUND_CLOSEST(clamp_val(val, 0, 2550), 10);
data->in[index][nr] = regval << 4;
reg = index == 1 ? ADC128_REG_IN_MIN(nr) : ADC128_REG_IN_MAX(nr);
i2c_smbus_write_byte_data(data->client, reg, regval);
@@ -222,7 +222,7 @@ static ssize_t adc128_set_temp(struct device *dev,
return err;
mutex_lock(&data->update_lock);
regval = clamp_val(DIV_ROUND_CLOSEST(val, 1000), -128, 127);
regval = DIV_ROUND_CLOSEST(clamp_val(val, -128000, 127000), 1000);
data->temp[index] = regval << 1;
i2c_smbus_write_byte_data(data->client,
index == 1 ? ADC128_REG_TEMP_MAX