linux-kernel - [PATCH 5.18 105/158] amt: drop unexpected advertisement message

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Message-Id: <20220727161025.678539930@linuxfoundation.org>
Date:   Wed, 27 Jul 2022 18:12:49 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Taehee Yoo <ap420073@...il.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.18 105/158] amt: drop unexpected advertisement message

From: Taehee Yoo <ap420073@...il.com>

[ Upstream commit 40185f359fbabaa61da754cc29d12f3a41e0a987 ]

AMT gateway interface should not receive unexpected advertisement messages.
In order to drop these packets, it should check nonce and amt->status.

Fixes: cbc21dc1cfe9 ("amt: add data plane of amt interface")
Signed-off-by: Taehee Yoo <ap420073@...il.com>
Signed-off-by: Paolo Abeni <pabeni@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/amt.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/amt.c b/drivers/net/amt.c
index 2fe56640e493..0811a5211ec4 100644
--- a/drivers/net/amt.c
+++ b/drivers/net/amt.c
@@ -2260,6 +2260,10 @@ static bool amt_advertisement_handler(struct amt_dev *amt, struct sk_buff *skb)
 	    ipv4_is_zeronet(amta->ip4))
 		return true;
 
+	if (amt->status != AMT_STATUS_SENT_DISCOVERY ||
+	    amt->nonce != amta->nonce)
+		return true;
+
 	amt->remote_ip = amta->ip4;
 	netdev_dbg(amt->dev, "advertised remote ip = %pI4\n", &amt->remote_ip);
 	mod_delayed_work(amt_wq, &amt->req_wq, 0);
@@ -2975,6 +2979,7 @@ static int amt_dev_open(struct net_device *dev)
 
 	amt->req_cnt = 0;
 	amt->remote_ip = 0;
+	amt->nonce = 0;
 	get_random_bytes(&amt->key, sizeof(siphash_key_t));
 
 	amt->status = AMT_STATUS_INIT;
-- 
2.35.1