From ab7d2e828b2e44afd86df3597d98bad14855efc3 Mon Sep 17 00:00:00 2001
From: Marco Oliverio <marco.oliverio@tanaza.com>
Date: Mon, 2 Dec 2019 19:54:30 +0100
Subject: [PATCH] netfilter: nf_queue: enqueue skbs with NULL dst

commit 0b9173f4688dfa7c5d723426be1d979c24ce3d51 upstream.

Bridge packets that are forwarded have skb->dst == NULL and get
dropped by the check introduced by
b60a77386b1d4868f72f6353d35dabe5fbe981f2 (net: make skb_dst_force
return true when dst is refcounted).

To fix this we check skb_dst() before skb_dst_force(), so we don't
drop skb packet with dst == NULL. This holds also for skb at the
PRE_ROUTING hook so we remove the second check.

Fixes: b60a77386b1d ("net: make skb_dst_force return true when dst is refcounted")
Signed-off-by: Marco Oliverio <marco.oliverio@tanaza.com>
Signed-off-by: Rocco Folino <rocco.folino@tanaza.com>
Acked-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

diff --git a/net/netfilter/nf_queue.c b/net/netfilter/nf_queue.c
index 2c440015ff0c..3d8aca9ac06d 100644
--- a/net/netfilter/nf_queue.c
+++ b/net/netfilter/nf_queue.c
@@ -190,7 +190,7 @@ static int __nf_queue(struct sk_buff *skb, const struct nf_hook_state *state,
 		goto err;
 	}
 
-	if (!skb_dst_force(skb) && state->hook != NF_INET_PRE_ROUTING) {
+	if (skb_dst(skb) && !skb_dst_force(skb)) {
 		status = -ENETDOWN;
 		goto err;
 	}
-- 
2.7.4