linux-kernel - Re: linux-next: manual merge of the driver-core tree with the driver-core.current tree

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Date:	Wed, 19 Jun 2013 07:39:18 -0700
From:	Greg KH <greg@...ah.com>
To:	Ming Lei <ming.lei@...onical.com>
Cc:	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
	Takashi Iwai <tiwai@...e.de>
Subject: Re: linux-next: manual merge of the driver-core tree with the
 driver-core.current tree

On Wed, Jun 19, 2013 at 02:58:39PM +0800, Ming Lei wrote:
> On Wed, Jun 19, 2013 at 1:32 PM, Stephen Rothwell <sfr@...b.auug.org.au> wrote:
> > Hi Greg,
> >
> > Today's linux-next merge of the driver-core tree got a conflict in
> > drivers/base/firmware_class.c between commit 875979368eb4 ("firmware
> > loader: fix use-after-free by double abort") from the driver-core.current
> > tree and commit fe304143b0c3 ("firmware: Avoid deadlock of usermodehelper
> > lock at shutdown") from the driver-core tree.
> >
> > I fixed it up (more may be required - see below) and can carry the fix as
> > necessary (no action is required).
> >
> > --
> > Cheers,
> > Stephen Rothwell                    sfr@...b.auug.org.au
> >
> > diff --cc drivers/base/firmware_class.c
> > index 01e2103,6ede229..0000000
> > --- a/drivers/base/firmware_class.c
> > +++ b/drivers/base/firmware_class.c
> > @@@ -446,22 -452,11 +452,18 @@@ static struct firmware_priv *to_firmwar
> >         return container_of(dev, struct firmware_priv, dev);
> >   }
> >
> > - static void fw_load_abort(struct firmware_priv *fw_priv)
> > + static void fw_load_abort(struct firmware_buf *buf)
> >   {
> > -       struct firmware_buf *buf = fw_priv->buf;
> > -
> >  +      /*
> >  +       * There is a small window in which user can write to 'loading'
> >  +       * between loading done and disappearance of 'loading'
> >  +       */
> >  +      if (test_bit(FW_STATUS_DONE, &buf->status))
> >  +              return;
> >  +
> > +       list_del_init(&buf->pending_list);
> >         set_bit(FW_STATUS_ABORT, &buf->status);
> >         complete_all(&buf->completion);
> > -
> > -       /* avoid user action after loading abort */
> > -       fw_priv->buf = NULL;
> 
> Hmm, maybe the most important part in the commit 875979368eb4
> ("firmware loader: fix use-after-free by double abort") has been removed, :-)
> 
> In fact, the commit 87597936 is for linus tree only because it is a fix,
> so the conflict is caused by merging it with other firmware loader patches
> in -next tree.
> 
> Greg, I can figure out one patch for -next easily, but it depends you
> push it on 3.10-rc or 3.11-rc.

I'll be pushing your patch for 3.10-final to Linus as it fixes a bug,
but I will need something to resolve the merge issue properly.  Can you
provide me that patch/merge?

thanks,

greg k-h
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