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

From: Greg KH
Date: Wed Dec 23 2009 - 12:18:22 EST


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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