linux-kernel - Re: [ 71/79] ext4: fix error handling in ext4_ext

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Message-ID: <20130728182721.GB16560@kroah.com>
Date:	Sun, 28 Jul 2013 11:27:21 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Theodore Ts'o <tytso@....edu>, Ben Hutchings <ben@...adent.org.uk>,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [ 71/79] ext4: fix error handling in ext4_ext_truncate()

On Sun, Jul 28, 2013 at 07:40:53AM -0400, Theodore Ts'o wrote:
> On Sat, Jul 27, 2013 at 10:33:31PM +0100, Ben Hutchings wrote:
> > > --- a/fs/ext4/extents.c
> > > +++ b/fs/ext4/extents.c
> > > @@ -4386,9 +4386,20 @@ void ext4_ext_truncate(handle_t *handle,
> > >  
> > >  	last_block = (inode->i_size + sb->s_blocksize - 1)
> > >  			>> EXT4_BLOCK_SIZE_BITS(sb);
> > > +retry:
> > >  	err = ext4_es_remove_extent(inode, last_block,
> > >  				    EXT_MAX_BLOCKS - last_block);
> > > +	if (err == ENOMEM) {
> > 
> > Positive ENOMEM?!  It looks like this value is bubbled up from
> > __es_insert_extent() which returns the usual negative error codes.
> 
> Nice catch.  Yup, that's a problem.  I'll fix this upstream and mark
> it cc:stable.
> 
> Until this goes upstream stable kernel maintainers can either: (a) fix
> up this patch by making the line read "err == -ENOMEM", (b) hold back
> this patch until the companion patch to fix this goes upstream, or (c)
> apply this now, since it's otherwise harmless and it does add error
> checking to the ext4_ext_remove_space() call.

I'll take it as-is and expect to see the fix come through Linus's tree
soon.

thanks,

greg k-h
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