linux-kernel - Re: [PATCH] direct_io: fix use after free in __blockdev_direct

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Message-ID: <20091217092942.GX14381@ZenIV.linux.org.uk>
Date:	Thu, 17 Dec 2009 09:29:42 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Xiaotian Feng <dfeng@...hat.com>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	Jens Axboe <jens.axboe@...cle.com>,
	Jeff Moyer <jmoyer@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Nikanth Karthikesan <knikanth@...e.de>,
	Zach Brown <zach.brown@...cle.com>
Subject: Re: [PATCH] direct_io: fix use after free in __blockdev_direct_IO

On Thu, Dec 17, 2009 at 04:49:32PM +0800, Xiaotian Feng wrote:
> @@ -1197,7 +1200,11 @@ __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode,
>  		(end > i_size_read(inode)));
>  
>  	retval = direct_io_worker(rw, iocb, inode, iov, offset,
> -				nr_segs, blkbits, get_block, end_io, dio);
> +				  nr_segs, blkbits, get_block, end_io,
> +				  dio, &dio_freed);
> +
> +	if (dio_freed)
> +		goto out;

Um... I'm not sure that this would be the right fix.  How about simple
s/dio->flags/flags/ in the line below?
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