diff mbox series

[4/4] hwmon: (w83627ehf) Fix underflows seen when writing limit attributes

Message ID 20240707144730.1490208-5-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/w83627ehf.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/drivers/hwmon/w83627ehf.c b/drivers/hwmon/w83627ehf.c
index fe960c0a624f..7d7d70afde65 100644
--- a/drivers/hwmon/w83627ehf.c
+++ b/drivers/hwmon/w83627ehf.c
@@ -895,7 +895,7 @@  store_target_temp(struct device *dev, struct device_attribute *attr,
 	if (err < 0)
 		return err;
 
-	val = clamp_val(DIV_ROUND_CLOSEST(val, 1000), 0, 127);
+	val = DIV_ROUND_CLOSEST(clamp_val(val, 0, 127000), 1000);
 
 	mutex_lock(&data->update_lock);
 	data->target_temp[nr] = val;
@@ -920,7 +920,7 @@  store_tolerance(struct device *dev, struct device_attribute *attr,
 		return err;
 
 	/* Limit the temp to 0C - 15C */
-	val = clamp_val(DIV_ROUND_CLOSEST(val, 1000), 0, 15);
+	val = DIV_ROUND_CLOSEST(clamp_val(val, 0, 15000), 1000);
 
 	mutex_lock(&data->update_lock);
 	reg = w83627ehf_read_value(data, W83627EHF_REG_TOLERANCE[nr]);