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 14:58:39 +0800
From:	Ming Lei <ming.lei@...onical.com>
To:	Stephen Rothwell <sfr@...b.auug.org.au>
Cc:	Greg KH <greg@...ah.com>, 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 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.


Thanks,
--
Ming Lei
--
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