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

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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>
This commit is contained in:
Johan Hovold 2020-06-01 15:39:46 +02:00 committed by Pavel Machek
parent eca21c2d86
commit 6f4aa35744
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->flags = pdata->flags;
led->master = pdev->dev.parent; led->master = pdev->dev.parent;
ret = devm_led_classdev_register(led->master, &led->cdev); ret = led_classdev_register(led->master, &led->cdev);
if (ret) { if (ret) {
dev_err(&pdev->dev, "failed to register LED %d\n", id); dev_err(&pdev->dev, "failed to register LED %d\n", id);
return ret; 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; return 0;
} }
@ -124,6 +135,7 @@ static struct platform_driver da903x_led_driver = {
.name = "da903x-led", .name = "da903x-led",
}, },
.probe = da903x_led_probe, .probe = da903x_led_probe,
.remove = da903x_led_remove,
}; };
module_platform_driver(da903x_led_driver); module_platform_driver(da903x_led_driver);