netdev - Re: [PATCH] ip6_gre: fix null-ptr-deref in ip6gre_init

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Date:   Mon, 13 Jul 2020 09:31:54 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Wei Yongjun <weiyongjun1@...wei.com>, hulkci@...wei.com,
        Eric Dumazet <eric.dumazet@...il.com>,
        Taehee Yoo <ap420073@...il.com>,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH] ip6_gre: fix null-ptr-deref in ip6gre_init_net()



On 7/13/20 8:59 AM, Wei Yongjun wrote:
> KASAN report null-ptr-deref error when register_netdev() failed:
> 
>
> 
> ip6gre_tunnel_uninit() has set 'ign->fb_tunnel_dev' to NULL, later
> access to ign->fb_tunnel_dev cause null-ptr-deref. Fix it by saving
> 'ign->fb_tunnel_dev' to local variable ndev.
> 
> Fixes: dafabb6590cb ("ip6_gre: fix use-after-free in ip6gre_tunnel_lookup()")
> Reported-by: Hulk Robot <hulkci@...wei.com>
> Signed-off-by: Wei Yongjun <weiyongjun1@...wei.com>
>

Reviewed-by: Eric Dumazet <edumazet@...gle.com>