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

commit d584221e683bbd173738603b83a315f27d27d043 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: 50154e29e5cc ("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>

diff --git a/drivers/leds/leds-lm3533.c b/drivers/leds/leds-lm3533.c
index 9504ad405aef8698e263c46f5ff89db81cfd3590..b3edee7031931eae380a762f30d866ac3af36da3 100644 (file)
--- a/drivers/leds/leds-lm3533.c
+++ b/drivers/leds/leds-lm3533.c
@@ -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;
 }