netdev - Re: [PATCH net] l2tp: fix race while getting PMTU on PPP pseudo-wire

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Date:	Fri, 05 Sep 2014 14:41:25 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	g.nault@...halink.fr
Cc:	netdev@...r.kernel.org, jchapman@...alix.com
Subject: Re: [PATCH net] l2tp: fix race while getting PMTU on PPP
 pseudo-wire

From: Guillaume Nault <g.nault@...halink.fr>
Date: Wed, 3 Sep 2014 14:12:55 +0200

> Use dst_entry held by sk_dst_get() to retrieve tunnel's PMTU.
> 
> The dst_mtu(__sk_dst_get(tunnel->sock)) call was racy. __sk_dst_get()
> could return NULL if tunnel->sock->sk_dst_cache was reset just before the
> call, thus making dst_mtu() dereference a NULL pointer:
 ...
> Signed-off-by: Guillaume Nault <g.nault@...halink.fr>

Applied and queued up for -stable, thanks!
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