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

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Message-Id: <200701111421.48125.oliver@neukum.org>
Date:	Thu, 11 Jan 2007 14:21:47 +0100
From:	Oliver Neukum <oliver@...kum.org>
To:	linux-usb-devel@...ts.sourceforge.net
Cc:	Pavel Machek <pavel@...e.cz>, 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

Am Mittwoch, 10. Januar 2007 21:38 schrieb Pavel Machek:
> 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.

With that config option, there's a race even on UP. probe() can
sleep.

	Regards
		Oliver
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