linux-kernel - Re: [PATCH v3] leds: Introduce userspace leds driver

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Date:   Thu, 15 Sep 2016 16:54:26 +0200
From:   Jacek Anaszewski <j.anaszewski@...sung.com>
To:     Pavel Machek <pavel@....cz>
Cc:     David Lechner <david@...hnology.com>,
        Richard Purdie <rpurdie@...ys.net>,
        linux-kernel@...r.kernel.org, linux-leds@...r.kernel.org,
        Marcel Holtmann <marcel@...tmann.org>
Subject: Re: [PATCH v3] leds: Introduce userspace leds driver

Hi Pavel,

On 09/15/2016 03:08 PM, Pavel Machek wrote:
> Hi!
>
>>> +	if (copy_from_user(&udev->user_dev, buffer,
>>> +			   sizeof(struct uleds_user_dev))) {
>>> +		ret = -EFAULT;
>>> +		goto out;
>>> +	}
>>> +
>>> +	if (!udev->user_dev.name[0]) {
>>> +		ret = -EINVAL;
>>> +		goto out;
>>> +	}
>>> +
>>> +	ret = led_classdev_register(NULL, &udev->led_cdev);
>>> +	if (ret < 0)
>>> +		goto out;
>
> No sanity checking on the name -> probably a security hole. Do not
> push this upstream before this is fixed.

Thanks for catching this.

David, please check if the LED name sticks to the LED class
device naming convention.

And one thing that caught my eye only now - please use
devm_led_classdev_register().

For now I'm dropping the patch.

-- 
Best regards,
Jacek Anaszewski