netdev - Re: [PATCH] ipcomp: double free at ipcomp

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Date:	Mon, 15 Feb 2010 09:32:33 +0200
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	davem@...emloft.net, netdev@...r.kernel.org
Subject: Re: [PATCH] ipcomp: double free at ipcomp_destroy()

On Mon, Feb 15, 2010 at 2:18 AM, Herbert Xu <herbert@...dor.apana.org.au> wrote:
> On Sun, Feb 14, 2010 at 04:44:15PM +0200, Alexey Dobriyan wrote:
>> Consider using ipcomp with tunnel mode:
>>
>>       pfkey_add -> xfrm_state_init -> x->type->init_state() == ipcomp4_init_state
>>
>> 1. If ipcomp_tunnel_attach() fails, xfrm_state private data (x->data) are freed
>>    first time (synchronously), but stale pointer is left.
>> 2. xfrm_state_init() failed, all right, we're going to do error unwind
>>    but this time asynchronously and we're going to double free x->data
>>    asynchronously.
>
> Sorry, I don't see the async path, where is it?

pfkey_add
pfkey_msg2xfrm_state
xfrm_init_state         [fails]
xfrm_state_put
__xfrm_state_destroy    [puts xfrm_state into GC list, schedule work]
xfrm_state_gc_task
xfrm_state_gc_destroy
x->type->destructor
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