Patch "netfilter: restart search if moved to other chain" has been added to the 4.4-stable tree

Patch "netfilter: restart search if moved to other chain" has been added to the 4.4-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    netfilter: restart search if moved to other chain

to the 4.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     netfilter-restart-search-if-moved-to-other-chain.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 95a8d19f28e6b29377a880c6264391a62e07fccc Mon Sep 17 00:00:00 2001
From: Florian Westphal <fw@strlen.de>
Date: Thu, 25 Aug 2016 15:33:29 +0200
Subject: netfilter: restart search if moved to other chain

From: Florian Westphal <fw@strlen.de>

commit 95a8d19f28e6b29377a880c6264391a62e07fccc upstream.

In case nf_conntrack_tuple_taken did not find a conflicting entry
check that all entries in this hash slot were tested and restart
in case an entry was moved to another chain.

Reported-by: Eric Dumazet <edumazet@google.com>
Fixes: ea781f197d6a ("netfilter: nf_conntrack: use SLAB_DESTROY_BY_RCU and get rid of call_rcu()")
Signed-off-by: Florian Westphal <fw@strlen.de>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Acked-by: Michal Kubecek <mkubecek@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 net/netfilter/nf_conntrack_core.c |    7 +++++++
 1 file changed, 7 insertions(+)

--- a/net/netfilter/nf_conntrack_core.c
+++ b/net/netfilter/nf_conntrack_core.c
@@ -719,6 +719,7 @@ nf_conntrack_tuple_taken(const struct nf
 	 * least once for the stats anyway.
 	 */
 	rcu_read_lock_bh();
+ begin:
 	hlist_nulls_for_each_entry_rcu(h, n, &net->ct.hash[hash], hnnode) {
 		ct = nf_ct_tuplehash_to_ctrack(h);
 		if (ct != ignored_conntrack &&
@@ -730,6 +731,12 @@ nf_conntrack_tuple_taken(const struct nf
 		}
 		NF_CT_STAT_INC(net, searched);
 	}
+
+	if (get_nulls_value(n) != hash) {
+		NF_CT_STAT_INC(net, search_restart);
+		goto begin;
+	}
+
 	rcu_read_unlock_bh();
 
 	return 0;


Patches currently in stable-queue which might be from fw@strlen.de are

queue-4.4/netfilter-x_tables-speed-up-jump-target-validation.patch
queue-4.4/netfilter-arp_tables-fix-invoking-32bit-iptable-p-input-accept-failed-in-64bit-kernel.patch
queue-4.4/netfilter-restart-search-if-moved-to-other-chain.patch
queue-4.4/netfilter-nfnetlink_queue-reject-verdict-request-from-different-portid.patch