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    Subject[PATCH v4 2/2] net: br_netfiler_hooks: Drops IPv6 packets if IPv6 module is not loaded
    Date
    A kernel panic can happen if a host has disabled IPv6 on boot and have to
    process guest packets (coming from a bridge) using it's ip6tables.

    IPv6 packets need to be dropped if the IPv6 module is not loaded.

    Signed-off-by: Leonardo Bras <leonardo@linux.ibm.com>
    ---
    net/bridge/br_netfilter_hooks.c | 2 ++
    1 file changed, 2 insertions(+)

    diff --git a/net/bridge/br_netfilter_hooks.c b/net/bridge/br_netfilter_hooks.c
    index d3f9592f4ff8..5e8693730df1 100644
    --- a/net/bridge/br_netfilter_hooks.c
    +++ b/net/bridge/br_netfilter_hooks.c
    @@ -493,6 +493,8 @@ static unsigned int br_nf_pre_routing(void *priv,
    brnet = net_generic(state->net, brnf_net_id);
    if (IS_IPV6(skb) || is_vlan_ipv6(skb, state->net) ||
    is_pppoe_ipv6(skb, state->net)) {
    + if (!ipv6_mod_enabled())
    + return NF_DROP;
    if (!brnet->call_ip6tables &&
    !br_opt_get(br, BROPT_NF_CALL_IP6TABLES))
    return NF_ACCEPT;
    --
    2.20.1
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