From 56f9b9502f2d15b9c7b83f9cfb32798e2e364f61 Mon Sep 17 00:00:00 2001 From: Florian Westphal Date: Mon, 13 Mar 2017 17:38:17 +0100 Subject: [PATCH] bridge: drop netfilter fake rtable unconditionally [ Upstream commit a13b2082ece95247779b9995c4e91b4246bed023 ] Andreas reports kernel oops during rmmod of the br_netfilter module. Hannes debugged the oops down to a NULL rt6info->rt6i_indev. Problem is that br_netfilter has the nasty concept of adding a fake rtable to skb->dst; this happens in a br_netfilter prerouting hook. A second hook (in bridge LOCAL_IN) is supposed to remove these again before the skb is handed up the stack. However, on module unload hooks get unregistered which means an skb could traverse the prerouting hook that attaches the fake_rtable, while the 'fake rtable remove' hook gets removed from the hooklist immediately after. Fixes: 34666d467cbf1e2e3c7 ("netfilter: bridge: move br_netfilter out of the core") Reported-by: Andreas Karis Debugged-by: Hannes Frederic Sowa Signed-off-by: Florian Westphal Acked-by: Pablo Neira Ayuso Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- net/bridge/br_input.c | 1 + net/bridge/br_netfilter_hooks.c | 21 --------------------- 2 files changed, 1 insertion(+), 21 deletions(-) diff --git a/net/bridge/br_input.c b/net/bridge/br_input.c index f7fba74108a937..e24754a0e052b3 100644 --- a/net/bridge/br_input.c +++ b/net/bridge/br_input.c @@ -29,6 +29,7 @@ EXPORT_SYMBOL(br_should_route_hook); static int br_netif_receive_skb(struct net *net, struct sock *sk, struct sk_buff *skb) { + br_drop_fake_rtable(skb); return netif_receive_skb(skb); } diff --git a/net/bridge/br_netfilter_hooks.c b/net/bridge/br_netfilter_hooks.c index 7ddbe7ec81d61d..97fc19f001bfff 100644 --- a/net/bridge/br_netfilter_hooks.c +++ b/net/bridge/br_netfilter_hooks.c @@ -516,21 +516,6 @@ static unsigned int br_nf_pre_routing(void *priv, } -/* PF_BRIDGE/LOCAL_IN ************************************************/ -/* The packet is locally destined, which requires a real - * dst_entry, so detach the fake one. On the way up, the - * packet would pass through PRE_ROUTING again (which already - * took place when the packet entered the bridge), but we - * register an IPv4 PRE_ROUTING 'sabotage' hook that will - * prevent this from happening. */ -static unsigned int br_nf_local_in(void *priv, - struct sk_buff *skb, - const struct nf_hook_state *state) -{ - br_drop_fake_rtable(skb); - return NF_ACCEPT; -} - /* PF_BRIDGE/FORWARD *************************************************/ static int br_nf_forward_finish(struct net *net, struct sock *sk, struct sk_buff *skb) { @@ -900,12 +885,6 @@ static struct nf_hook_ops br_nf_ops[] __read_mostly = { .hooknum = NF_BR_PRE_ROUTING, .priority = NF_BR_PRI_BRNF, }, - { - .hook = br_nf_local_in, - .pf = NFPROTO_BRIDGE, - .hooknum = NF_BR_LOCAL_IN, - .priority = NF_BR_PRI_BRNF, - }, { .hook = br_nf_forward_ip, .pf = NFPROTO_BRIDGE,