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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Date:	Wed, 23 Dec 2009 17:15:11 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Greg KH <greg@...ah.com>
Cc:	Alan Stern <stern@...land.harvard.edu>, linux-usb@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Stefani Seibold <stefani@...bold.net>,
	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 Wednesday 23 December 2009, Greg KH wrote:
> 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?

Previously write_fifo was allocated by kfifo_alloc() along with the structure
members.  Now kfifo_alloc() expects to get a pointer to existing structure.

> Does your patch solve the oops?

Sure, that's why I posted it. :-)

Rafael
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