From: Dan Carpenter <dan.carpenter@oracle.com>
To: Jean Delvare <jdelvare@suse.com>, Guenter Roeck <linux@roeck-us.net>
Cc: linux-hwmon@vger.kernel.org, kernel-janitors@vger.kernel.org
Subject: [patch] hwmon: (max31790) potential ERR_PTR dereference
Date: Wed, 12 Oct 2016 06:24:52 +0000 [thread overview]
Message-ID: <20161012062452.GX12841@mwanda> (raw)
We should only dereference "data" after we check if it is an error
pointer.
Fixes: 54187ff9d766 ('hwmon: (max31790) Convert to use new hwmon registration API')
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
diff --git a/drivers/hwmon/max31790.c b/drivers/hwmon/max31790.c
index bef84e0..c1b9275 100644
--- a/drivers/hwmon/max31790.c
+++ b/drivers/hwmon/max31790.c
@@ -268,11 +268,13 @@ static int max31790_read_pwm(struct device *dev, u32 attr, int channel,
long *val)
{
struct max31790_data *data = max31790_update_device(dev);
- u8 fan_config = data->fan_config[channel];
+ u8 fan_config;
if (IS_ERR(data))
return PTR_ERR(data);
+ fan_config = data->fan_config[channel];
+
switch (attr) {
case hwmon_pwm_input:
*val = data->pwm[channel] >> 8;
next reply other threads:[~2016-10-12 6:24 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-12 6:24 Dan Carpenter [this message]
2016-10-12 12:57 ` hwmon: (max31790) potential ERR_PTR dereference Guenter Roeck
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