netdev - Re: Wrong usage of hash in L2TP leading to NULL ptr derefs

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Message-ID: <4FC3A599.1040909@katalix.com>
Date:	Mon, 28 May 2012 17:19:37 +0100
From:	James Chapman <jchapman@...alix.com>
To:	Sasha Levin <levinsasha928@...il.com>
CC:	Eric Dumazet <eric.dumazet@...il.com>,
	David Miller <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Wrong usage of hash in L2TP leading to NULL ptr derefs

On 28/05/12 17:12, Sasha Levin wrote:
> Hi all,
> 
> Looking at net/l2tp/l2tp_ip{6}.c, l2tp uses UDP for communications, but
> uses inet_hash and inet_unhash for hashing - which appears to be wrong
> (and causes NULL ptr derefs during runtime).

L2TPv3 also supports IP encapsulation, which is L2TP directly in IP, no
UDP. That's what the l2tp_ip[6] code implements.

Can you post an oops with steps for how to reproduce it?


-- 
James Chapman
Katalix Systems Ltd
http://www.katalix.com
Catalysts for your Embedded Linux software development
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