[PATCH 3.16 162/346] netfilter: nfnetlink_queue: reject verdict request from different portid

[Ben Hutchings]

3.16.39-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Liping Zhang <liping.zhang@xxxxxxxxxxxxxx>

commit 00a3101f561816e58de054a470484996f78eb5eb upstream.

Like NFQNL_MSG_VERDICT_BATCH do, we should also reject the verdict
request when the portid is not same with the initial portid(maybe
from another process).

Fixes: 97d32cf9440d ("netfilter: nfnetlink_queue: batch verdict support")
Signed-off-by: Liping Zhang <liping.zhang@xxxxxxxxxxxxxx>
Reviewed-by: Florian Westphal <fw@xxxxxxxxx>
Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
[bwh: Backported to 3.16: adjust filename]
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
 net/netfilter/nfnetlink_queue_core.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

--- a/net/netfilter/nfnetlink_queue_core.c
+++ b/net/netfilter/nfnetlink_queue_core.c
@@ -985,10 +985,8 @@ nfqnl_recv_verdict(struct sock *ctnl, st
 	struct net *net = sock_net(ctnl);
 	struct nfnl_queue_net *q = nfnl_queue_pernet(net);
 
-	queue = instance_lookup(q, queue_num);
-	if (!queue)
-		queue = verdict_instance_lookup(q, queue_num,
-						NETLINK_CB(skb).portid);
+	queue = verdict_instance_lookup(q, queue_num,
+					NETLINK_CB(skb).portid);
 	if (IS_ERR(queue))
 		return PTR_ERR(queue);