linux-kernel - Re: [PATCH 3.8-stable] kernel/audit_tree.c: tree will leak memory when failure occurs in audit_trim

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Message-ID: <20130508103611.GB3763@hercules>
Date:	Wed, 8 May 2013 11:36:11 +0100
From:	Luis Henriques <luis.henriques@...onical.com>
To:	Jonghwan Choi <jhbird.choi@...sung.com>
Cc:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	'Chen Gang' <gang.chen@...anux.com>,
	'Al Viro' <viro@...iv.linux.org.uk>
Subject: Re: [PATCH 3.8-stable]  kernel/audit_tree.c: tree will leak memory
 when failure occurs in audit_trim_trees()

On Tue, Apr 30, 2013 at 05:44:01PM +0900, Jonghwan Choi wrote:
> This patch looks like it should be in the 3.8-stable tree, should we apply
> it?

This commit seems to be applicable to other stable trees as well (3.0,
3.2, 3.5, ...).

Cheers,
--
Luis


> 
> ------------------
> 
> From: "Chen Gang <gang.chen@...anux.com>"
> 
> commit 12b2f117f3bf738c1a00a6f64393f1953a740bd4 upstream
> 
> audit_trim_trees() calls get_tree().  If a failure occurs we must call
> put_tree().
> 
> [akpm@...ux-foundation.org: run put_tree() before mutex_lock() for small
> scalability improvement]
> Signed-off-by: Chen Gang <gang.chen@...anux.com>
> Cc: Al Viro <viro@...iv.linux.org.uk>
> Cc: Eric Paris <eparis@...hat.com>
> Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
> Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
> Signed-off-by: Jonghwan Choi <jhbird.choi@...sung.com>
> ---
>  kernel/audit_tree.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/kernel/audit_tree.c b/kernel/audit_tree.c
> index 642a89c..a291aa2 100644
> --- a/kernel/audit_tree.c
> +++ b/kernel/audit_tree.c
> @@ -617,9 +617,9 @@ void audit_trim_trees(void)
>  		}
>  		spin_unlock(&hash_lock);
>  		trim_marked(tree);
> -		put_tree(tree);
>  		drop_collected_mounts(root_mnt);
>  skip_it:
> +		put_tree(tree);
>  		mutex_lock(&audit_filter_mutex);
>  	}
>  	list_del(&cursor);
> -- 
> 1.7.9.5
> 
> --
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