linux-kernel - Re: [linux-usb-devel] 2.6.20-rc4: null pointer deref in khubd

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Date:	Wed, 10 Jan 2007 11:14:39 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Oliver Neukum <oneukum@...e.de>
cc:	Pavel Machek <pavel@....cz>,
	<linux-usb-devel@...ts.sourceforge.net>,
	Andrew Morton <akpm@...l.org>, Greg KH <greg@...ah.com>,
	kernel list <linux-kernel@...r.kernel.org>
Subject: Re: [linux-usb-devel] 2.6.20-rc4: null pointer deref in khubd

On Wed, 10 Jan 2007, Oliver Neukum wrote:

> Am Mittwoch, 10. Januar 2007 11:49 schrieb Pavel Machek:
> > usb 2-1: new full speed USB device using uhci_hcd and address 68
> > usb 2-1: USB disconnect, address 68
> > usb 2-1: unable to read config index 0 descriptor/start
> > usb 2-1: chopping to 0 config(s)
> 
> Does anybody know a legitimate reasons a device should have
> 0 configurations? Independent of the reason of this bug, should we disallow
> such devices and error out?

About the only reason to allow such devices is so that the user can run 
lsusb to try and get more information about the problem.  With no 
configurations, the device won't be useful for anything.

Alan Stern

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