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leds: lm36274: fix use-after-free on unbind 

commit a0972fff09 upstream.

Several MFD child drivers register their class devices directly under
the parent device. This means you cannot use devres 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: 11e1bbc116 ("leds: lm36274: Introduce the TI LM36274 LED driver")
Cc: stable <stable@vger.kernel.org>     # 5.3
Cc: Dan Murphy <dmurphy@ti.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 15:39:48 +02:00 committed by Greg Kroah-Hartman
parent 635f8fcc2e
commit bde8f23c03
1 changed files with 12 additions and 3 deletions
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15
drivers/leds/leds-lm36274.c
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@ -133,7 +133,7 @@ static int lm36274_probe(struct platform_device *pdev)
lm36274_data->pdev = pdev;
lm36274_data->dev = lmu->dev;
lm36274_data->regmap = lmu->regmap;
dev_set_drvdata(&pdev->dev, lm36274_data);
platform_set_drvdata(pdev, lm36274_data);
ret = lm36274_parse_dt(lm36274_data);
if (ret) {
@ -147,8 +147,16 @@ static int lm36274_probe(struct platform_device *pdev)
return ret;
}
return devm_led_classdev_register(lm36274_data->dev,
&lm36274_data->led_dev);
return led_classdev_register(lm36274_data->dev, &lm36274_data->led_dev);
}
static int lm36274_remove(struct platform_device *pdev)
{
struct lm36274 *lm36274_data = platform_get_drvdata(pdev);
led_classdev_unregister(&lm36274_data->led_dev);
return 0;
}
static const struct of_device_id of_lm36274_leds_match[] = {
@ -159,6 +167,7 @@ MODULE_DEVICE_TABLE(of, of_lm36274_leds_match);
static struct platform_driver lm36274_driver = {
.probe = lm36274_probe,
.remove = lm36274_remove,
.driver = {
.name = "lm36274-leds",
},