linux-kernel - Re: [PATCH v4 1/2] netfilter: Terminate rule eval if protocol=IPv6 and ipv6 module is disabled

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Message-ID: <99e3ef9c5ead1c95df697d49ab9cc83a95b0ac7c.camel@linux.ibm.com>
Date:   Tue, 03 Sep 2019 13:46:50 -0300
From:   Leonardo Bras <leonardo@...ux.ibm.com>
To:     Pablo Neira Ayuso <pablo@...filter.org>
Cc:     netfilter-devel@...r.kernel.org, coreteam@...filter.org,
        bridge@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, FlorianWestphal <fw@...len.de>,
        Jozsef Kadlecsik <kadlec@...filter.org>,
        Roopa Prabhu <roopa@...ulusnetworks.com>,
        Nikolay Aleksandrov <nikolay@...ulusnetworks.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH v4 1/2] netfilter: Terminate rule eval if protocol=IPv6
 and ipv6 module is disabled

On Fri, 2019-08-30 at 22:58 +0200, Florian Westphal wrote:
> Leonardo Bras <leonardo@...ux.ibm.com> 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.
> > 
> > Signed-off-by: Leonardo Bras <leonardo@...ux.ibm.com>
> 
> Acked-by: Florian Westphal <fw@...len.de>
> 

Hello Pablo,

Any trouble with this patch? 
I could see the other* one got applied, but not this one.
*(The other did not get acked, so i released it alone as v5)

Is there any fix I need to do in this one?

Best regards,
Leonardo Bras

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