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authorDarrick J. Wong <djwong@us.ibm.com>2008-11-13 00:26:57 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2008-11-13 04:17:17 +0300
commit05a9bd46e49a9cbb09a0c61c901642a9911bf56e (patch)
tree1cc75a39d9551e95425f9cd2605f2d50d3fee7ee /drivers/hwmon
parent7e036d040a28bf95255d7eb9faf0ffbba3677e99 (diff)
downloadlinux-05a9bd46e49a9cbb09a0c61c901642a9911bf56e.tar.xz
adt7470: check input range when sysfs files are written
Implement correct range checking for adt7470 to prevent userland from writing impossible values into the chip, and cap out-of-range values per standard hwmon conventions. Implement correct rounding of input values per standard hwmon conventions. Signed-off-by: Darrick J. Wong <djwong@us.ibm.com> Cc: Jean Delvare <khali@linux-fr.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/hwmon')
-rw-r--r--drivers/hwmon/adt7470.c75
1 files changed, 62 insertions, 13 deletions
diff --git a/drivers/hwmon/adt7470.c b/drivers/hwmon/adt7470.c
index d368d8f845e1..1311a595147e 100644
--- a/drivers/hwmon/adt7470.c
+++ b/drivers/hwmon/adt7470.c
@@ -137,6 +137,8 @@ I2C_CLIENT_INSMOD_1(adt7470);
#define FAN_PERIOD_INVALID 65535
#define FAN_DATA_VALID(x) ((x) && (x) != FAN_PERIOD_INVALID)
+#define ROUND_DIV(x, divisor) (((x) + ((divisor) / 2)) / (divisor))
+
struct adt7470_data {
struct device *hwmon_dev;
struct attribute_group attrs;
@@ -353,7 +355,13 @@ static ssize_t set_temp_min(struct device *dev,
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct i2c_client *client = to_i2c_client(dev);
struct adt7470_data *data = i2c_get_clientdata(client);
- int temp = simple_strtol(buf, NULL, 10) / 1000;
+ long temp;
+
+ if (strict_strtol(buf, 10, &temp))
+ return -EINVAL;
+
+ temp = ROUND_DIV(temp, 1000);
+ temp = SENSORS_LIMIT(temp, 0, 255);
mutex_lock(&data->lock);
data->temp_min[attr->index] = temp;
@@ -381,7 +389,13 @@ static ssize_t set_temp_max(struct device *dev,
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct i2c_client *client = to_i2c_client(dev);
struct adt7470_data *data = i2c_get_clientdata(client);
- int temp = simple_strtol(buf, NULL, 10) / 1000;
+ long temp;
+
+ if (strict_strtol(buf, 10, &temp))
+ return -EINVAL;
+
+ temp = ROUND_DIV(temp, 1000);
+ temp = SENSORS_LIMIT(temp, 0, 255);
mutex_lock(&data->lock);
data->temp_max[attr->index] = temp;
@@ -430,11 +444,13 @@ static ssize_t set_fan_max(struct device *dev,
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct i2c_client *client = to_i2c_client(dev);
struct adt7470_data *data = i2c_get_clientdata(client);
- int temp = simple_strtol(buf, NULL, 10);
+ long temp;
- if (!temp)
+ if (strict_strtol(buf, 10, &temp) || !temp)
return -EINVAL;
+
temp = FAN_RPM_TO_PERIOD(temp);
+ temp = SENSORS_LIMIT(temp, 1, 65534);
mutex_lock(&data->lock);
data->fan_max[attr->index] = temp;
@@ -465,11 +481,13 @@ static ssize_t set_fan_min(struct device *dev,
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct i2c_client *client = to_i2c_client(dev);
struct adt7470_data *data = i2c_get_clientdata(client);
- int temp = simple_strtol(buf, NULL, 10);
+ long temp;
- if (!temp)
+ if (strict_strtol(buf, 10, &temp) || !temp)
return -EINVAL;
+
temp = FAN_RPM_TO_PERIOD(temp);
+ temp = SENSORS_LIMIT(temp, 1, 65534);
mutex_lock(&data->lock);
data->fan_min[attr->index] = temp;
@@ -507,9 +525,12 @@ static ssize_t set_force_pwm_max(struct device *dev,
{
struct i2c_client *client = to_i2c_client(dev);
struct adt7470_data *data = i2c_get_clientdata(client);
- int temp = simple_strtol(buf, NULL, 10);
+ long temp;
u8 reg;
+ if (strict_strtol(buf, 10, &temp))
+ return -EINVAL;
+
mutex_lock(&data->lock);
data->force_pwm_max = temp;
reg = i2c_smbus_read_byte_data(client, ADT7470_REG_CFG);
@@ -537,7 +558,12 @@ static ssize_t set_pwm(struct device *dev, struct device_attribute *devattr,
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct i2c_client *client = to_i2c_client(dev);
struct adt7470_data *data = i2c_get_clientdata(client);
- int temp = simple_strtol(buf, NULL, 10);
+ long temp;
+
+ if (strict_strtol(buf, 10, &temp))
+ return -EINVAL;
+
+ temp = SENSORS_LIMIT(temp, 0, 255);
mutex_lock(&data->lock);
data->pwm[attr->index] = temp;
@@ -564,7 +590,12 @@ static ssize_t set_pwm_max(struct device *dev,
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct i2c_client *client = to_i2c_client(dev);
struct adt7470_data *data = i2c_get_clientdata(client);
- int temp = simple_strtol(buf, NULL, 10);
+ long temp;
+
+ if (strict_strtol(buf, 10, &temp))
+ return -EINVAL;
+
+ temp = SENSORS_LIMIT(temp, 0, 255);
mutex_lock(&data->lock);
data->pwm_max[attr->index] = temp;
@@ -592,7 +623,12 @@ static ssize_t set_pwm_min(struct device *dev,
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct i2c_client *client = to_i2c_client(dev);
struct adt7470_data *data = i2c_get_clientdata(client);
- int temp = simple_strtol(buf, NULL, 10);
+ long temp;
+
+ if (strict_strtol(buf, 10, &temp))
+ return -EINVAL;
+
+ temp = SENSORS_LIMIT(temp, 0, 255);
mutex_lock(&data->lock);
data->pwm_min[attr->index] = temp;
@@ -630,7 +666,13 @@ static ssize_t set_pwm_tmin(struct device *dev,
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct i2c_client *client = to_i2c_client(dev);
struct adt7470_data *data = i2c_get_clientdata(client);
- int temp = simple_strtol(buf, NULL, 10) / 1000;
+ long temp;
+
+ if (strict_strtol(buf, 10, &temp))
+ return -EINVAL;
+
+ temp = ROUND_DIV(temp, 1000);
+ temp = SENSORS_LIMIT(temp, 0, 255);
mutex_lock(&data->lock);
data->pwm_tmin[attr->index] = temp;
@@ -658,11 +700,14 @@ static ssize_t set_pwm_auto(struct device *dev,
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct i2c_client *client = to_i2c_client(dev);
struct adt7470_data *data = i2c_get_clientdata(client);
- int temp = simple_strtol(buf, NULL, 10);
int pwm_auto_reg = ADT7470_REG_PWM_CFG(attr->index);
int pwm_auto_reg_mask;
+ long temp;
u8 reg;
+ if (strict_strtol(buf, 10, &temp))
+ return -EINVAL;
+
if (attr->index % 2)
pwm_auto_reg_mask = ADT7470_PWM2_AUTO_MASK;
else
@@ -716,10 +761,14 @@ static ssize_t set_pwm_auto_temp(struct device *dev,
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct i2c_client *client = to_i2c_client(dev);
struct adt7470_data *data = i2c_get_clientdata(client);
- int temp = cvt_auto_temp(simple_strtol(buf, NULL, 10));
int pwm_auto_reg = ADT7470_REG_PWM_AUTO_TEMP(attr->index);
+ long temp;
u8 reg;
+ if (strict_strtol(buf, 10, &temp))
+ return -EINVAL;
+
+ temp = cvt_auto_temp(temp);
if (temp < 0)
return temp;