linux-kernel - Re: [PATCH] ip6_vti: fix a null pointer deference when destroy vti6 tunnel

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Message-Id: <20180819.195617.287376807384738076.davem@davemloft.net>
Date:   Sun, 19 Aug 2018 19:56:17 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     yanhaishuang@...s.chinamobile.com
Cc:     steffen.klassert@...unet.com, kuznet@....inr.ac.ru,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ip6_vti: fix a null pointer deference when destroy
 vti6 tunnel

From: Haishuang Yan <yanhaishuang@...s.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@...s.chinamobile.com>

Ugh, applied, thanks.