linux-kernel - Re: [BUG] hfs_find_init() sb->ext

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Message-ID: <20110610214036.GA23163@infradead.org>
Date:	Fri, 10 Jun 2011 17:40:36 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Clement LECIGNE <clement.lecigne@...asq.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [BUG] hfs_find_init() sb->ext_tree NULL pointer dereference

On Wed, Jun 08, 2011 at 01:07:55PM +0200, Clement LECIGNE wrote:
> Hi,
> 
> hfs_find_init() is wrongly assuming that sb->ext_tree has already been opened
> and is not NULL but this function can be called when sb->ext_tree is currently
> being opened (NULL deref).

Well, it can't happen in practice.  The extent file always fits into
the first blocks for a valid extents file.  And yes, you could
artifically construct a filesystem where this is not true, and if you
want to be cool call it a security issue.  But in the end anyone who
mounts untrusted disk images has much worse issues than this, so don't
do it.

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