linux-kernel - Re: 2.6.20-rc4: null pointer deref in khubd

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Message-ID: <20070110203809.GA6378@ucw.cz>
Date:	Wed, 10 Jan 2007 20:38:09 +0000
From:	Pavel Machek <pavel@...e.cz>
To:	Oliver Neukum <oneukum@...e.de>
Cc:	linux-usb-devel@...ts.sourceforge.net,
	kernel list <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...l.org>, Greg KH <greg@...ah.com>
Subject: Re: 2.6.20-rc4: null pointer deref in khubd

Hi!

> > 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?

It is not bad device, btw, but extremely flakey connector. Bug is
random :-(, and machine is smp, so it might even be a race.

						Pavel
-- 
Thanks for all the (sleeping) penguins.
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