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    SubjectRe: [PATCH v4 1/2] netfilter: Terminate rule eval if protocol=IPv6 and ipv6 module is disabled
    Leonardo Bras <leonardo@linux.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@linux.ibm.com>

    Acked-by: Florian Westphal <fw@strlen.de>

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