Commit 47a459ec authored by Johan Hovold's avatar Johan Hovold Committed by Pavel Machek

leds: wm831x-status: fix use-after-free on unbind

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: 8d3b6a40 ("leds: wm831x-status: Use devm_led_classdev_register")
Cc: stable <stable@vger.kernel.org>     # 4.6
Cc: Amitoj Kaur Chawla <amitoj1606@gmail.com>
Signed-off-by: default avatarJohan Hovold <johan@kernel.org>
Signed-off-by: default avatarPavel Machek <pavel@ucw.cz>
parent a0972fff
...@@ -269,12 +269,23 @@ static int wm831x_status_probe(struct platform_device *pdev) ...@@ -269,12 +269,23 @@ static int wm831x_status_probe(struct platform_device *pdev)
drvdata->cdev.blink_set = wm831x_status_blink_set; drvdata->cdev.blink_set = wm831x_status_blink_set;
drvdata->cdev.groups = wm831x_status_groups; drvdata->cdev.groups = wm831x_status_groups;
ret = devm_led_classdev_register(wm831x->dev, &drvdata->cdev); ret = led_classdev_register(wm831x->dev, &drvdata->cdev);
if (ret < 0) { if (ret < 0) {
dev_err(&pdev->dev, "Failed to register LED: %d\n", ret); dev_err(&pdev->dev, "Failed to register LED: %d\n", ret);
return ret; return ret;
} }
platform_set_drvdata(pdev, drvdata);
return 0;
}
static int wm831x_status_remove(struct platform_device *pdev)
{
struct wm831x_status *drvdata = platform_get_drvdata(pdev);
led_classdev_unregister(&drvdata->cdev);
return 0; return 0;
} }
...@@ -283,6 +294,7 @@ static struct platform_driver wm831x_status_driver = { ...@@ -283,6 +294,7 @@ static struct platform_driver wm831x_status_driver = {
.name = "wm831x-status", .name = "wm831x-status",
}, },
.probe = wm831x_status_probe, .probe = wm831x_status_probe,
.remove = wm831x_status_remove,
}; };
module_platform_driver(wm831x_status_driver); module_platform_driver(wm831x_status_driver);
......
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