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leds: lm3533: fix use-after-free on unbind 

commit d584221e68 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: 50154e29e5 ("leds: lm3533: 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 15:39:47 +02:00 committed by Greg Kroah-Hartman
parent 385c1ae9dd
commit 3564cddefb
1 changed files with 9 additions and 3 deletions
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12
drivers/leds/leds-lm3533.c
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@ -694,7 +694,7 @@ static int lm3533_led_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, led);
ret = devm_led_classdev_register(pdev->dev.parent, &led->cdev);
ret = led_classdev_register(pdev->dev.parent, &led->cdev);
if (ret) {
dev_err(&pdev->dev, "failed to register LED %d\n", pdev->id);
return ret;
@ -704,13 +704,18 @@ static int lm3533_led_probe(struct platform_device *pdev)
ret = lm3533_led_setup(led, pdata);
if (ret)
return ret;
goto err_deregister;
ret = lm3533_ctrlbank_enable(&led->cb);
if (ret)
return ret;
goto err_deregister;
return 0;
err_deregister:
led_classdev_unregister(&led->cdev);
return ret;
}
static int lm3533_led_remove(struct platform_device *pdev)
@ -720,6 +725,7 @@ static int lm3533_led_remove(struct platform_device *pdev)
dev_dbg(&pdev->dev, "%s\n", __func__);
lm3533_ctrlbank_disable(&led->cb);
led_classdev_unregister(&led->cdev);
return 0;
}