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Commit fe6402e0 authored by Johan Hovold's avatar Johan Hovold Committed by Greg Kroah-Hartman
Browse files

leds: 88pm860x: fix use-after-free on unbind 



commit eca21c2d8655387823d695b26e6fe78cf3975c05 upstream.

Several MFD child drivers register their class devices directly under
the parent device. This means you cannot blindly do devres conversions
so that deregistration ends up being tied to the parent device,
something which leads to use-after-free on driver unbind when the class
device is released while still being registered.

Fixes: 375446df ("leds: 88pm860x: Use devm_led_classdev_register")
Cc: stable <stable@vger.kernel.org>     # 4.6
Cc: Amitoj Kaur Chawla <amitoj1606@gmail.com>
Signed-off-by: default avatarJohan Hovold <johan@kernel.org>
Signed-off-by: default avatarPavel Machek <pavel@ucw.cz>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 3564cdde

drivers/leds/leds-88pm860x.c

+13 −1
Original line number Diff line number Diff line
@@ -203,21 +203,33 @@ static int pm860x_led_probe(struct platform_device *pdev) 
	data->cdev.brightness_set_blocking = pm860x_led_set;

	mutex_init(&data->lock);



	ret = devm_led_classdev_register(chip->dev, &data->cdev);

	ret = led_classdev_register(chip->dev, &data->cdev);

	if (ret < 0) {

		dev_err(&pdev->dev, "Failed to register LED: %d\n", ret);

		return ret;

	}

	pm860x_led_set(&data->cdev, 0);



	platform_set_drvdata(pdev, data);



	return 0;

}



static int pm860x_led_remove(struct platform_device *pdev)

{

	struct pm860x_led *data = platform_get_drvdata(pdev);



	led_classdev_unregister(&data->cdev);



	return 0;

}



static struct platform_driver pm860x_led_driver = {

	.driver	= {

		.name	= "88pm860x-led",

	},

	.probe	= pm860x_led_probe,

	.remove	= pm860x_led_remove,

};



module_platform_driver(pm860x_led_driver);