Commit 534e28d8 authored Oct 16, 2017 by Miquel Raynal Committed by Guenter Roeck Oct 29, 2017

hwmon: (gpio-fan) Fix null pointer dereference at probe

A previous commit changed the argument list of gpio_fan_get_of_data(),
removing the "struct *dev" argument and retrieving it instead from the
gpio_fan_data structure. The "dev" entry of gpio_fan_data was then
dereferenced to access the of_node field, leading to a kernel panic
during the probe as the "dev" entry of the gpio_fan_data structure was
not filled yet.

Fix this by setting fan_data->dev before calling gpio_fan_get_of_data().

Fixes: 5859d8d30737 ("hwmon: (gpio-fan) Get rid of platform data struct")
Signed-off-by: Miquel Raynal <miquel.raynal@free-electrons.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

parent 9de382fd

drivers/hwmon/gpio-fan.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -510,11 +510,11 @@ static int gpio_fan_probe(struct platform_device *pdev)
		if (!fan_data)
		return -ENOMEM;

		fan_data->dev = dev;
		err = gpio_fan_get_of_data(fan_data);
		if (err)
		return err;

		fan_data->dev = dev;
		platform_set_drvdata(pdev, fan_data);
		mutex_init(&fan_data->lock);