Showing error 1728

User: Jiri Slaby
Error type: Invalid Pointer Dereference
Error type description: A pointer which is invalid is being dereferenced
File location: drivers/hwmon/lm80.c
Line in file: 288
Project: Linux Kernel
Project version: 2.6.28
Tools: Smatch (1.59)
Entered: 2013-09-10 20:24:52 UTC

Source: 

258                        "supported. Choose one of 1, 2, 4 or 8!\n", val);
259                mutex_unlock(&data->update_lock);
260                return -EINVAL;
261        }
262
263        reg = (lm80_read_value(client, LM80_REG_FANDIV) & ~(3 << (2 * (nr + 1))))
264            | (data->fan_div[nr] << (2 * (nr + 1)));
265        lm80_write_value(client, LM80_REG_FANDIV, reg);
266
267        /* Restore fan_min */
268        data->fan_min[nr] = FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
269        lm80_write_value(client, LM80_REG_FAN_MIN(nr + 1), data->fan_min[nr]);
270        mutex_unlock(&data->update_lock);
271
272        return count;
273}
274
275static ssize_t show_temp_input1(struct device *dev, struct device_attribute *attr, char *buf)
276{
277        struct lm80_data *data = lm80_update_device(dev);
278        return sprintf(buf, "%ld\n", TEMP_FROM_REG(data->temp));
279}
280
281#define show_temp(suffix, value) \
282static ssize_t show_temp_##suffix(struct device *dev, struct device_attribute *attr, char *buf) \
283{ \
284        struct lm80_data *data = lm80_update_device(dev); \
285        return sprintf(buf, "%d\n", TEMP_LIMIT_FROM_REG(data->value)); \
286}
287show_temp(hot_max, temp_hot_max);
288show_temp(hot_hyst, temp_hot_hyst);
289show_temp(os_max, temp_os_max);
290show_temp(os_hyst, temp_os_hyst);
291
292#define set_temp(suffix, value, reg) \
293static ssize_t set_temp_##suffix(struct device *dev, struct device_attribute *attr, const char *buf, \
294        size_t count) \
295{ \
296        struct i2c_client *client = to_i2c_client(dev); \
297        struct lm80_data *data = i2c_get_clientdata(client); \
298        long val = simple_strtoul(buf, NULL, 10); \
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