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[1/4] hwmon: (adc128d818) Fix underflows seen when writing limit attributes

Message ID 20240707144730.1490208-2-linux@roeck-us.net (mailing list archive)
State Accepted
Headers show
Series hwmon: Fix underflows seen when writing limit attributes | expand

Commit Message

Guenter Roeck July 7, 2024, 2:47 p.m. UTC 
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>
---
 drivers/hwmon/adc128d818.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/drivers/hwmon/adc128d818.c b/drivers/hwmon/adc128d818.c
index 8ac6e735ec5c..5e805d4ee76a 100644
--- a/drivers/hwmon/adc128d818.c
+++ b/drivers/hwmon/adc128d818.c
@@ -175,7 +175,7 @@  static ssize_t adc128_in_store(struct device *dev,
 
 	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);
@@ -213,7 +213,7 @@  static ssize_t adc128_temp_store(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