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leds: 88pm860x: fix use-after-free on unbind
commiteca21c2d86
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:375446df95
("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: Johan Hovold <johan@kernel.org> Signed-off-by: Pavel Machek <pavel@ucw.cz> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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1 changed files with 13 additions and 1 deletions
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@ -203,21 +203,33 @@ static int pm860x_led_probe(struct platform_device *pdev)
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data->cdev.brightness_set_blocking = pm860x_led_set;
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mutex_init(&data->lock);
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ret = devm_led_classdev_register(chip->dev, &data->cdev);
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ret = led_classdev_register(chip->dev, &data->cdev);
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if (ret < 0) {
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dev_err(&pdev->dev, "Failed to register LED: %d\n", ret);
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return ret;
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}
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pm860x_led_set(&data->cdev, 0);
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platform_set_drvdata(pdev, data);
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return 0;
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}
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static int pm860x_led_remove(struct platform_device *pdev)
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{
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struct pm860x_led *data = platform_get_drvdata(pdev);
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led_classdev_unregister(&data->cdev);
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return 0;
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}
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static struct platform_driver pm860x_led_driver = {
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.driver = {
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.name = "88pm860x-led",
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},
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.probe = pm860x_led_probe,
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.remove = pm860x_led_remove,
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};
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module_platform_driver(pm860x_led_driver);
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