linux-kernel - Re: [PATCH] kernel/auditfilter.c: need process 'tree' when audit_add_watch() failed in audit_add

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Date:	Wed, 22 May 2013 14:18:18 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Chen Gang <gang.chen@...anux.com>
Cc:	Al Viro <viro@...iv.linux.org.uk>, Eric Paris <eparis@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] kernel/auditfilter.c: need process 'tree' when
 audit_add_watch() failed in audit_add_rule().

On Fri, 10 May 2013 18:12:26 +0800 Chen Gang <gang.chen@...anux.com> wrote:

> 
> If both 'tree' and 'watch' are valid, need call audit_put_tree(), just
> like the upper area has done within function audit_add_rule().
> 
> Signed-off-by: Chen Gang <gang.chen@...anux.com>
> ---
>  kernel/auditfilter.c |    6 ++++++
>  1 files changed, 6 insertions(+), 0 deletions(-)
> 
> diff --git a/kernel/auditfilter.c b/kernel/auditfilter.c
> index f9fc54b..81f63f9 100644
> --- a/kernel/auditfilter.c
> +++ b/kernel/auditfilter.c
> @@ -952,6 +952,12 @@ static inline int audit_add_rule(struct audit_entry *entry)
>  		err = audit_add_watch(&entry->rule, &list);
>  		if (err) {
>  			mutex_unlock(&audit_filter_mutex);
> +			/*
> +			 * normally audit_add_tree_rule() will free it
> +			 * on failure
> +			 */
> +			if (tree)
> +				audit_put_tree(tree);
>  			goto error;
>  		}
>  	}

Are you sure?  Or is the earlier audit_put_tree(tree) wrong?

Where is the "get" which this "put" is undoing?
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