linux-kernel - [PATCH 4.14 084/101] netfilter: nf_conncount: dont skip eviction when age is negative

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Message-Id: <20190107105337.538883836@linuxfoundation.org>
Date:   Mon,  7 Jan 2019 13:33:12 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Shawn Bohrer <sbohrer@...udflare.com>,
        Florian Westphal <fw@...len.de>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        Mauricio Faria de Oliveira <mfo@...onical.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.14 084/101] netfilter: nf_conncount: dont skip eviction when age is negative

4.14-stable review patch.  If anyone has any objections, please let me know.

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

commit 4cd273bb91b3001f623f516ec726c49754571b1a upstream.

(not in Linus's tree now, but in nf.git + linux-next.git already.)

age is signed integer, so result can be negative when the timestamps
have a large delta.  In this case we want to discard the entry.

Instead of using age >= 2 || age < 0, just make it unsigned.

Fixes: b36e4523d4d56 ("netfilter: nf_conncount: fix garbage collection confirm race")
Reviewed-by: Shawn Bohrer <sbohrer@...udflare.com>
Signed-off-by: Florian Westphal <fw@...len.de>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>

[mfo: backport: use older file name, nf_conncount.c -> xt_connlimit.c]
Signed-off-by: Mauricio Faria de Oliveira <mfo@...onical.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/netfilter/xt_connlimit.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/netfilter/xt_connlimit.c b/net/netfilter/xt_connlimit.c
index 913b86ef3a8d..b1646c24a632 100644
--- a/net/netfilter/xt_connlimit.c
+++ b/net/netfilter/xt_connlimit.c
@@ -141,7 +141,7 @@ find_or_evict(struct net *net, struct xt_connlimit_conn *conn)
 	const struct nf_conntrack_tuple_hash *found;
 	unsigned long a, b;
 	int cpu = raw_smp_processor_id();
-	__s32 age;
+	u32 age;
 
 	found = nf_conntrack_find_get(net, &conn->zone, &conn->tuple);
 	if (found)
-- 
2.19.1