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Date:   Wed, 29 Mar 2017 09:26:57 -0700 (PDT)
From:   David Miller <>
Subject: Re: [PATCH net] l2tp: hold tunnel socket when handling control
 frames in l2tp_ip and l2tp_ip6

From: Guillaume Nault <>
Date: Wed, 29 Mar 2017 08:44:59 +0200

> The code following l2tp_tunnel_find() expects that a new reference is
> held on sk. Either sk_receive_skb() or the discard_put error path will
> drop a reference from the tunnel's socket.
> This issue exists in both l2tp_ip and l2tp_ip6.
> Fixes: a3c18422a4b4 ("l2tp: hold socket before dropping lock in l2tp_ip{, 6}_recv()")
> Signed-off-by: Guillaume Nault <>


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