linux-kernel - Re: IPv4: ip_options_compile() how can we avoid blowing up on a NULL skb???

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Date:	Thu, 16 Nov 2006 18:47:30 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	jesper.juhl@...il.com
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: IPv4: ip_options_compile() how can we avoid blowing up on a
 NULL skb???

From: "Jesper Juhl" <jesper.juhl@...il.com>
Date: Thu, 16 Nov 2006 23:34:14 +0100

> So if 'skb' is NULL, the only route I see that doesn't cause a NULL
> pointer deref is if  (opt != NULL)  and at the same time
> (opt->is_data != NULL)  .   Is that guaranteed in any way?

Yes, it is guarenteed, all callers  make sure these invariants
hold true.

I'm very happy to accept a patch which assert's this using BUG()
checks :-)
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