From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH] ip6_vti: fix a null pointer deference when destroy
 vti6 tunnel
Date: Sun, 19 Aug 2018 19:56:17 -0700 (PDT)
Message-ID: <20180819.195617.287376807384738076.davem@davemloft.net>
References: <1534733465-2493-1-git-send-email-yanhaishuang@cmss.chinamobile.com>
Mime-Version: 1.0
Content-Type: Text/Plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Cc: steffen.klassert@secunet.com, kuznet@ms2.inr.ac.ru,
        netdev@vger.kernel.org, linux-kernel@vger.kernel.org
To: yanhaishuang@cmss.chinamobile.com
Return-path: <linux-kernel-owner@vger.kernel.org>
In-Reply-To: <1534733465-2493-1-git-send-email-yanhaishuang@cmss.chinamobile.com>
Sender: linux-kernel-owner@vger.kernel.org
List-Id: netdev.vger.kernel.org

From: Haishuang Yan <yanhaishuang@cmss.chinamobile.com>
Date: Mon, 20 Aug 2018 10:51:05 +0800

> If load ip6_vti module and create a network namespace when set
> fb_tunnels_only_for_init_net to 1, then exit the namespace will
> cause following crash:
 ...
> This because ip6n->tnls_wc[0] point to fallback device in default, but
> in non-default namespace, ip6n->tnls_wc[0] will be NULL, so add the NULL
> check comparatively.
> 
> Fixes: e2948e5af8ee ("ip6_vti: fix creating fallback tunnel device for vti6")
> Signed-off-by: Haishuang Yan <yanhaishuang@cmss.chinamobile.com>

Ugh, applied, thanks.