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

From: Leonardo Bras
Date: Tue Sep 03 2019 - 12:47:15 EST

On Fri, 2019-08-30 at 22:58 +0200, Florian Westphal wrote:
> Leonardo Bras <leonardo@xxxxxxxxxxxxx> 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@xxxxxxxxxxxxx>
> Acked-by: Florian Westphal <fw@xxxxxxxxx>

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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