[PATCH v4 2/2] net: br_netfiler_hooks: Drops IPv6 packets if IPv6 module is not loaded

Leonardo Bras
2019-08-30T18:14:36Z

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