linux-kernel - Re: [patch] drivers: Fix bogus 0 error return in device

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Date:	Thu, 10 Dec 2009 12:56:23 -0800
From:	Greg KH <gregkh@...e.de>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Kay Sievers <kay.sievers@...y.org>
Subject: Re: [patch] drivers: Fix bogus 0 error return in device_add()

On Thu, Dec 10, 2009 at 07:32:49PM -0000, Thomas Gleixner wrote:
> If device_add() is called with a device which does not have dev->p set
> up, then device_private_init() is called. If that succeeds, then the
> error variable is set to 0. Now if the dev_name(dev) check further
> down fails, then device_add() correctly terminates, but returns 0.
> That of course lets the driver progress. If later another driver uses
> this half set up device as parent then device_add() of the child
> device explodes and renders sysfs completely unusable.
> 
> Set the error to -EINVAL if dev_name() check fails.

That's a good catch, thanks.

Is anything currently triggering this?  Or did you just find it by
reading the code?

thanks,

greg k-h
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