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Date:   Tue, 3 Sep 2019 22:55:34 +0200
From:   Pablo Neira Ayuso <pablo@netfilter.org>
To:     Leonardo Bras <leonardo@linux.ibm.com>
Cc:     netfilter-devel@vger.kernel.org, coreteam@netfilter.org,
        bridge@lists.linux-foundation.org, netdev@vger.kernel.org,
        linux-kernel@vger.kernel.org,
        Jozsef Kadlecsik <kadlec@netfilter.org>,
        Florian Westphal <fw@strlen.de>,
        Roopa Prabhu <roopa@cumulusnetworks.com>,
        Nikolay Aleksandrov <nikolay@cumulusnetworks.com>,
        "David S. Miller" <davem@davemloft.net>
Subject: Re: [PATCH v4 1/2] netfilter: Terminate rule eval if protocol=IPv6
 and ipv6 module is disabled
Message-ID: <20190903205534.bxcty7pja5bvru5f@salvia>
References: <20190830181354.26279-1-leonardo@linux.ibm.com>
 <20190830181354.26279-2-leonardo@linux.ibm.com>
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On Fri, Aug 30, 2019 at 03:13:53PM -0300, Leonardo Bras wrote:
> If IPv6 is disabled on boot (ipv6.disable=1), but nft_fib_inet ends up
> dealing with a IPv6 packet, it causes a kernel panic in
> fib6_node_lookup_1(), crashing in bad_page_fault.
> 
> The panic is caused by trying to deference a very low address (0x38
> in ppc64le), due to ipv6.fib6_main_tbl = NULL.
> BUG: Kernel NULL pointer dereference at 0x00000038
> 
> The kernel panic was reproduced in a host that disabled IPv6 on boot and
> have to process guest packets (coming from a bridge) using it's ip6tables.
> 
> Terminate rule evaluation when packet protocol is IPv6 but the ipv6 module
> is not loaded.

Patch is applied, thanks.