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authorGuenter Roeck <linux@roeck-us.net>2015-01-19 09:16:53 -0800
committerGuenter Roeck <linux@roeck-us.net>2015-01-25 21:23:59 -0800
commite2c26f058e31619b548046b84fe2c2116cb5016f (patch)
tree889f1f0e0b4c96ca91eb35972d5afa1131022c19 /drivers/hwmon/jc42.c
parent3a05633b042fb4aea65b09ce2d0d43689df6eb9a (diff)
downloadlinux-e2c26f058e31619b548046b84fe2c2116cb5016f.tar.bz2
hwmon: (jc42) Fix integer overflow when writing hysteresis value
Subtracting an unsigned long from a signed value causes an overflow with large values. Use clamp_val() to reduce the number range prior to subtracting it from the temperature limit. Signed-off-by: Guenter Roeck <linux@roeck-us.net> Reviewed-by: Jean Delvare <jdelvare@suse.de>
Diffstat (limited to 'drivers/hwmon/jc42.c')
-rw-r--r--drivers/hwmon/jc42.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/hwmon/jc42.c b/drivers/hwmon/jc42.c
index f8e3bbbf019c..a46cb65cacb5 100644
--- a/drivers/hwmon/jc42.c
+++ b/drivers/hwmon/jc42.c
@@ -312,7 +312,9 @@ static ssize_t set_temp_crit_hyst(struct device *dev,
if (kstrtoul(buf, 10, &val) < 0)
return -EINVAL;
+ val = clamp_val(val, 0, JC42_TEMP_MAX);
diff = jc42_temp_from_reg(data->temp[t_crit]) - val;
+
hyst = 0;
if (diff > 0) {
if (diff < 2250)