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leds: da903x: fix use-after-free on unbind 

commit 6f4aa35744 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: eed16255d6 ("leds: da903x: Use devm_led_classdev_register")
Cc: stable <stable@vger.kernel.org>     # 4.6
Cc: Amitoj Kaur Chawla <amitoj1606@gmail.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
5.4-rM2-2.2.x-imx-squashed
Johan Hovold 2020-06-01 15:39:46 +02:00 committed by Greg Kroah-Hartman
parent bde8f23c03
commit 385c1ae9dd
1 changed files with 13 additions and 1 deletions
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14
drivers/leds/leds-da903x.c
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@ -110,12 +110,23 @@ static int da903x_led_probe(struct platform_device *pdev)
led->flags = pdata->flags;
led->master = pdev->dev.parent;
ret = devm_led_classdev_register(led->master, &led->cdev);
ret = led_classdev_register(led->master, &led->cdev);
if (ret) {
dev_err(&pdev->dev, "failed to register LED %d\n", id);
return ret;
}
platform_set_drvdata(pdev, led);
return 0;
}
static int da903x_led_remove(struct platform_device *pdev)
{
struct da903x_led *led = platform_get_drvdata(pdev);
led_classdev_unregister(&led->cdev);
return 0;
}
@ -124,6 +135,7 @@ static struct platform_driver da903x_led_driver = {
.name = "da903x-led",
},
.probe = da903x_led_probe,
.remove = da903x_led_remove,
};
module_platform_driver(da903x_led_driver);