linux-kernel - Re: [PATCH] kernel: auditfilter: looping issue, memory leak if has 2 or more AUDIT

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Date:	Thu, 11 Apr 2013 12:10:35 +0800
From:	Chen Gang <gang.chen@...anux.com>
To:	Eric Paris <eparis@...hat.com>
CC:	Al Viro <viro@...iv.linux.org.uk>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kernel: auditfilter: looping issue, memory leak if has
 2 or more AUDIT_FILTERKEYs

On 2013年04月11日 05:19, Eric Paris wrote:
> ----- Original Message -----
> 
>> >   b. has an new issue for AUDIT_DIR:
>> >        after AUDIT_DIR succeed, it will set rule->tree.
>> >        next, the other case fail, then will call audit_free_rule.
>> >        but audit_free_rule will not free rule->tree.
> Definitely a couple of leaks here...
> 
> I'm seeing leaks on size 8, 64, and 128.
> 
> Al, what do you think?  Should I be calling audit_put_tree() in the error case if entry->tree != NULL?  The audit trees are some of the most complex code in the kernel I think.
> 
> 

  can we add it in audit_free_rule ?

  maybe like this:

@@ -75,6 +75,8 @@ static inline void audit_free_rule(struct audit_entry *e)
 	/* some rules don't have associated watches */
 	if (erule->watch)
 		audit_put_watch(erule->watch);
+	if (erule->tree)
+		audit_put_tree(erule->tree);
 	if (erule->fields)
 		for (i = 0; i < erule->field_count; i++) {
 			struct audit_field *f = &erule->fields[i];


  thanks.

  :-)

-- 
Chen Gang

Asianux Corporation
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