linux-kernel - Re: [Regression, 2.6.33-rc1->current git] NULL pointer in usb_serial_probe() introduced by the recent kfifo changes

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Message-ID: <20091223171731.GA7535@kroah.com>
Date:	Wed, 23 Dec 2009 09:17:31 -0800
From:	Greg KH <greg@...ah.com>
To:	Stefani Seibold <stefani@...bold.net>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Alan Stern <stern@...land.harvard.edu>,
	linux-usb@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [Regression, 2.6.33-rc1->current git] NULL pointer in
 usb_serial_probe() introduced by the recent kfifo changes

On Wed, Dec 23, 2009 at 09:10:48AM +0100, Stefani Seibold wrote:
> Am Dienstag, den 22.12.2009, 21:37 -0800 schrieb Greg KH:
> > On Wed, Dec 23, 2009 at 02:51:31AM +0100, Rafael J. Wysocki wrote:
> > > Hi,
> > > 
> > > Something like the patch below is necessary to fix a new NULL pointer deref
> > > in usb_serial_probe() that appeared after the recent kfifo changes (in short,
> > > the kfifo changes modified the semantics of kfifo_alloc() that
> > > usb_serial_probe() reiled on).
> > 
> > What semantic changed?  I thought that the kfifo patches came with
> > patches that also fixed up any changed that were needed.  What went
> > wrong here?
> > 
> 
> This one is a new user of the kfifo API, so it forget to port it to the
> new kfifo API.
> 
> Please make the write_fifo in place. Here is my patch to fix the
> regression and full ported version.

Thanks, I'll queue this up and send it to Linus later today.

greg k-h
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