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 09:12:45 +0800
From:	Chen Gang <gang.chen@...anux.com>
To:	Eric Paris <eparis@...hat.com>
CC:	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 05:38, Eric Paris wrote:
> ----- Original Message -----
>> > 
>> >   also for function audit_list_rules:
>> >     when call audit_make_reply fails (will return NULL).
>> >     we also need process data->buf, not only data itself.
>> > 
>> >   please help check, thanks.
> struct audit_rule_data {
> [...]
>         char            buf[0]; /* string fields buffer */
> };
> 
> The last element in the struct is 0 length.  But the allocation in audit_krule_to_data() looks like:
> 
> data = kmalloc(sizeof(*data) + krule->buflen, GFP_KERNEL);
> 
> So now data->buf appears as an allocation of size krule->buflen.
> 
> We do not need to free it separately.  This is a pretty common C trick.

  ok, thanks

  it is my fault.

  :-)

-- 
Chen Gang

Asianux Corporation
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