hwmon: (lm95241) Check validity of input values

This clears the following build-time warnings I was seeing:

drivers/hwmon/lm95241.c: In function "set_interval":
drivers/hwmon/lm95241.c:132:15: warning: ignoring return value of "strict_strtol", declared with attribute warn_unused_result
drivers/hwmon/lm95241.c: In function "set_max2":
drivers/hwmon/lm95241.c:278:1: warning: ignoring return value of "strict_strtol", declared with attribute warn_unused_result
drivers/hwmon/lm95241.c: In function "set_max1":
drivers/hwmon/lm95241.c:277:1: warning: ignoring return value of "strict_strtol", declared with attribute warn_unused_result
drivers/hwmon/lm95241.c: In function "set_min2":
drivers/hwmon/lm95241.c:249:1: warning: ignoring return value of "strict_strtol", declared with attribute warn_unused_result
drivers/hwmon/lm95241.c: In function "set_min1":
drivers/hwmon/lm95241.c:248:1: warning: ignoring return value of "strict_strtol", declared with attribute warn_unused_result
drivers/hwmon/lm95241.c: In function "set_type2":
drivers/hwmon/lm95241.c:220:1: warning: ignoring return value of "strict_strtol", declared with attribute warn_unused_result
drivers/hwmon/lm95241.c: In function "set_type1":
drivers/hwmon/lm95241.c:219:1: warning: ignoring return value of "strict_strtol", declared with attribute warn_unused_result

This also fixes a small race in set_interval() as a side effect: by
working with a temporary local variable we prevent data->interval from
being accessed at a time it contains the interval value in the wrong
unit.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: Davide Rizzo <elpa.rizzo@gmail.com>

diff --git a/drivers/hwmon/lm95241.c b/drivers/hwmon/lm95241.c
index 464340f..4546d82 100644 (file)
--- a/drivers/hwmon/lm95241.c
+++ b/drivers/hwmon/lm95241.c
@@ -128,9 +128,12 @@ static ssize_t set_interval(struct device *dev, struct device_attribute *attr,
 {
        struct i2c_client *client = to_i2c_client(dev);
        struct lm95241_data *data = i2c_get_clientdata(client);
+       unsigned long val;
 
-       strict_strtol(buf, 10, &data->interval);
-       data->interval = data->interval * HZ / 1000;
+       if (strict_strtoul(buf, 10, &val) < 0)
+               return -EINVAL;
+
+       data->interval = val * HZ / 1000;
 
        return count;
 }
@@ -188,7 +191,9 @@ static ssize_t set_type##flag(struct device *dev, \
        struct lm95241_data *data = i2c_get_clientdata(client); \
 \
        long val; \
-       strict_strtol(buf, 10, &val); \
+\
+       if (strict_strtol(buf, 10, &val) < 0) \
+               return -EINVAL; \
 \
        if ((val == 1) || (val == 2)) { \
 \
@@ -227,7 +232,9 @@ static ssize_t set_min##flag(struct device *dev, \
        struct lm95241_data *data = i2c_get_clientdata(client); \
 \
        long val; \
-       strict_strtol(buf, 10, &val); \
+\
+       if (strict_strtol(buf, 10, &val) < 0) \
+               return -EINVAL;\
 \
        mutex_lock(&data->update_lock); \
 \
@@ -256,7 +263,9 @@ static ssize_t set_max##flag(struct device *dev, \
        struct lm95241_data *data = i2c_get_clientdata(client); \
 \
        long val; \
-       strict_strtol(buf, 10, &val); \
+\
+       if (strict_strtol(buf, 10, &val) < 0) \
+               return -EINVAL; \
 \
        mutex_lock(&data->update_lock); \
 \