Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752928AbYKGS5a (ORCPT ); Fri, 7 Nov 2008 13:57:30 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752560AbYKGS4q (ORCPT ); Fri, 7 Nov 2008 13:56:46 -0500 Received: from e3.ny.us.ibm.com ([32.97.182.143]:44860 "EHLO e3.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751938AbYKGS4n (ORCPT ); Fri, 7 Nov 2008 13:56:43 -0500 From: "Darrick J. Wong" Subject: [PATCH 3/5] adt7470: Check input range when sysfs files are written To: "Darrick J. Wong" , Jean Delvare Cc: Andrew Morton , linux-kernel , lm-sensors Date: Fri, 07 Nov 2008 10:56:36 -0800 Message-ID: <20081107185636.13022.54109.stgit@elm3a70.beaverton.ibm.com> In-Reply-To: <20081107185621.13022.61885.stgit@elm3a70.beaverton.ibm.com> References: <20081107185621.13022.61885.stgit@elm3a70.beaverton.ibm.com> User-Agent: StGIT/0.13 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 6424 Lines: 193 Implement correct rounding and range checking for adt7470. Signed-off-by: Darrick J. Wong --- drivers/hwmon/adt7470.c | 75 +++++++++++++++++++++++++++++++++++++++-------- 1 files changed, 62 insertions(+), 13 deletions(-) diff --git a/drivers/hwmon/adt7470.c b/drivers/hwmon/adt7470.c index d368d8f..1311a59 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; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/