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Date:   Wed, 29 Mar 2017 09:27:07 -0700 (PDT)
From:   David Miller <>
Subject: Re: [PATCH net] l2tp: purge socket queues in the .destruct()

From: Guillaume Nault <>
Date: Wed, 29 Mar 2017 08:45:29 +0200

> The Rx path may grab the socket right before pppol2tp_release(), but
> nothing guarantees that it will enqueue packets before
> skb_queue_purge(). Therefore, the socket can be destroyed without its
> queues fully purged.
> Fix this by purging queues in pppol2tp_session_destruct() where we're
> guaranteed nothing is still referencing the socket.
> Fixes: 9e9cb6221aa7 ("l2tp: fix userspace reception on plain L2TP sockets")
> Signed-off-by: Guillaume Nault <>


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