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

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Date:	Thu, 10 Dec 2009 22:01:10 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Greg KH <gregkh@...e.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, 10 Dec 2009, Greg KH wrote:
> 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?

Hans-Juergen had a buggy vendor driver where init_name was not
initialized. So the driver probing succeeded and after that a
depending driver crashed somewhere in device_add().

Thanks,

	tglx
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