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 --- drivers/leds/leds-lm3533.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-)
diff --git a/drivers/leds/leds-lm3533.c b/drivers/leds/leds-lm3533.c index 9504ad405aef..b3edee703193 100644 --- 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; }