From: Johan Hovold johan@kernel.org
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
--- drivers/leds/leds-lm3533.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-)
--- a/drivers/leds/leds-lm3533.c +++ b/drivers/leds/leds-lm3533.c @@ -698,7 +698,7 @@ static int lm3533_led_probe(struct platf
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; @@ -708,13 +708,18 @@ static int lm3533_led_probe(struct platf
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) @@ -724,6 +729,7 @@ static int lm3533_led_remove(struct plat dev_dbg(&pdev->dev, "%s\n", __func__);
lm3533_ctrlbank_disable(&led->cb); + led_classdev_unregister(&led->cdev);
return 0; }