linux-kernel - Re: [PATCH 3.10 76/85] Fix mountpoint reference leakage in linkat

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Date:	Thu, 20 Mar 2014 20:11:22 -0400
From:	Oleg Drokin <green@...uxhacker.ru>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	Al Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH 3.10 76/85] Fix mountpoint reference leakage in linkat

Hello!

On Mar 20, 2014, at 8:10 PM, Greg Kroah-Hartman wrote:

> 3.10-stable review patch.  If anyone has any objections, please let me know.
> 
> ------------------
> 
> From: Oleg Drokin <green@...uxhacker.ru>
> 
> commit d22e6338db7f613dd4f6095c190682fcc519e4b7 upstream.
> 
> Recent changes to retry on ESTALE in linkat
> (commit 442e31ca5a49e398351b2954b51f578353fdf210)
> introduced a mountpoint reference leak and a small memory
> leak in case a filesystem link operation returns ESTALE
> which is pretty normal for distributed filesystems like
> lustre, nfs and so on.
> Free old_path in such a case.
> 
> [AV: there was another missing path_put() nearby - on the previous
> goto retry]

This comment loses sense in this version because there's no previous goto retry,
though it might not be important due to it just being a port of an upstream commit, I guess.

> 
> Signed-off-by: Oleg Drokin: <green@...uxhacker.ru>
> Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> 
> ---
> fs/namei.c |    1 +
> 1 file changed, 1 insertion(+)
> 
> --- a/fs/namei.c
> +++ b/fs/namei.c
> @@ -3655,6 +3655,7 @@ retry:
> out_dput:
> 	done_path_create(&new_path, new_dentry);
> 	if (retry_estale(error, how)) {
> +		path_put(&old_path);
> 		how |= LOOKUP_REVAL;
> 		goto retry;
> 	}
> 

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