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hwmon: (adt7475) Potential error pointer dereferences

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The adt7475_update_device() function returns error pointers.  The
problem is that in show_pwmfreq() we dereference it before the check.
And then in pwm_use_point2_pwm_at_crit_show() there isn't a check at
all.  I don't know if it's required, but it silences a static checker
warning and it's doesn't hurt anything to check.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Tokunori Ikegami <ikegami@allied-telesis.co.jp>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Dan Carpenter 2018-08-14 12:12:36 +03:00 committed by Guenter Roeck
parent 3ad867001c
commit 9d19371df5
1 changed files with 8 additions and 3 deletions
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11
drivers/hwmon/adt7475.c
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@ -962,13 +962,14 @@ static ssize_t show_pwmfreq(struct device *dev, struct device_attribute *attr,
{
struct adt7475_data *data = adt7475_update_device(dev);
struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
int i = clamp_val(data->range[sattr->index] & 0xf, 0,
ARRAY_SIZE(pwmfreq_table) - 1);
int idx;
if (IS_ERR(data))
return PTR_ERR(data);
idx = clamp_val(data->range[sattr->index] & 0xf, 0,
ARRAY_SIZE(pwmfreq_table) - 1);
return sprintf(buf, "%d\n", pwmfreq_table[i]);
return sprintf(buf, "%d\n", pwmfreq_table[idx]);
}
static ssize_t set_pwmfreq(struct device *dev, struct device_attribute *attr,
@ -1004,6 +1005,10 @@ static ssize_t pwm_use_point2_pwm_at_crit_show(struct device *dev,
char *buf)
{
struct adt7475_data *data = adt7475_update_device(dev);
if (IS_ERR(data))
return PTR_ERR(data);
return sprintf(buf, "%d\n", !!(data->config4 & CONFIG4_MAXDUTY));
}