linux-kernel - Re: [PATCH] Fix mountpoint reference leakage in linkat

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Date:	Fri, 31 Jan 2014 18:11:29 -0500
From:	Jeff Layton <jlayton@...hat.com>
To:	Al Viro <viro@...IV.linux.org.uk>
Cc:	Oleg Drokin <green@...uxhacker.ru>, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH] Fix mountpoint reference leakage in linkat

On Fri, 31 Jan 2014 22:30:14 +0000
Al Viro <viro@...IV.linux.org.uk> wrote:

> On Fri, Jan 31, 2014 at 04:32:31PM -0500, Jeff Layton wrote:
> 
> >  	done_path_create(&new_path, new_dentry);
> > +	path_put(&old_path);
> 
> ... and the filesystem in question isn't pinned anymore, so it can be
> unmounted, except that
> 
> >  	if (delegated_inode) {
> >  		error = break_deleg_wait(&delegated_inode);
> 
> this does an iput() on delegated_inode.  And umount really doesn't
> like finding pinned inodes.  Sorry, no go.
> 
> I'm going with Oleg's patch with second path_put() added.

Good point. I hadn't considered that. Oleg's second patch looks good to
me too.

-- 
Jeff Layton <jlayton@...hat.com>
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