From 9d19371df50a73301aec66a479b490587e889055 Mon Sep 17 00:00:00 2001 From: Dan Carpenter Date: Tue, 14 Aug 2018 12:12:36 +0300 Subject: [PATCH] hwmon: (adt7475) Potential error pointer dereferences 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 Reviewed-by: Tokunori Ikegami Signed-off-by: Guenter Roeck --- drivers/hwmon/adt7475.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) diff --git a/drivers/hwmon/adt7475.c b/drivers/hwmon/adt7475.c index 90837f7..1604514 100644 --- a/drivers/hwmon/adt7475.c +++ b/drivers/hwmon/adt7475.c @@ -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)); } -- 2.7.4