linux-kernel - Re: [ 68/89] xfs: fix _xfs_buf_find oops on blocks beyond the filesystem end

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Message-ID: <20130213161845.GA20916@kroah.com>
Date:	Wed, 13 Feb 2013 08:18:45 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Paolo Bonzini <pbonzini@...hat.com>
Cc:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	Dave Chinner <dchinner@...hat.com>,
	Brian Foster <bfoster@...hat.com>, Ben Myers <bpm@....com>,
	CAI Qian <caiqian@...hat.com>
Subject: Re: [ 68/89] xfs: fix _xfs_buf_find oops on blocks beyond the
 filesystem end

On Wed, Feb 13, 2013 at 04:30:32PM +0100, Paolo Bonzini wrote:
> Il 01/02/2013 14:08, Greg Kroah-Hartman ha scritto:
> > 3.7-stable review patch.  If anyone has any objections, please let me know.
> > 
> > ------------------
> > 
> > From: Dave Chinner <dchinner@...hat.com>
> > 
> > commit eb178619f930fa2ba2348de332a1ff1c66a31424 upstream.
> > 
> > When _xfs_buf_find is passed an out of range address, it will fail
> > to find a relevant struct xfs_perag and oops with a null
> > dereference. This can happen when trying to walk a filesystem with a
> > metadata inode that has a partially corrupted extent map (i.e. the
> > block number returned is corrupt, but is otherwise intact) and we
> > try to read from the corrupted block address.
> > 
> > In this case, just fail the lookup. If it is readahead being issued,
> > it will simply not be done, but if it is real read that fails we
> > will get an error being reported.  Ideally this case should result
> > in an EFSCORRUPTED error being reported, but we cannot return an
> > error through xfs_buf_read() or xfs_buf_get() so this lookup failure
> > may result in ENOMEM or EIO errors being reported instead.
> 
> It looks like this breaks xfs_growfs.  See
> http://bugzilla.redhat.com/show_bug.cgi?id=909602.

Ick, not good.

Dave, any thoughts here?  Should I drop this from the 3.7-stable queue?

greg k-h
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