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

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Message-ID: <20100216052901.GB27643@gondor.apana.org.au>
Date:	Tue, 16 Feb 2010 13:29:01 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Alexey Dobriyan <adobriyan@...il.com>
Cc:	davem@...emloft.net, netdev@...r.kernel.org
Subject: Re: [PATCH] ipcomp: double free at ipcomp_destroy()

On Mon, Feb 15, 2010 at 05:50:49PM +0200, Alexey Dobriyan wrote:
>
> Then checks for NULL ->tunnel, and NULL ->data should be removed.
> In fact, I don't quite understand why destruction was done this way,
> so simply cleared ->data pointer.

I had a look and I don't think we can do that (unless I misunderstood
what you meant).

The NULL ipcd check in ipcomp_destroy is to handle the case where
ipcomp_init_state fails before it even gets to allocating ipcd.

While the NULL tunnel check in xfrm_state_delete_tunnel is for the
case where we failed before successfully attaching a tunnel.

Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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