netdev - [PATCH net 2/8] can: j1939: j1939_can_recv(): ignore messages with invalid source address

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Message-Id: <20211106215449.57946-3-mkl@pengutronix.de>
Date:   Sat,  6 Nov 2021 22:54:43 +0100
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, kuba@...nel.org, linux-can@...r.kernel.org,
        kernel@...gutronix.de,
        Zhang Changzhong <zhangchangzhong@...wei.com>,
        stable@...r.kernel.org, Oleksij Rempel <o.rempel@...gutronix.de>,
        Marc Kleine-Budde <mkl@...gutronix.de>
Subject: [PATCH net 2/8] can: j1939: j1939_can_recv(): ignore messages with invalid source address

From: Zhang Changzhong <zhangchangzhong@...wei.com>

According to SAE-J1939-82 2015 (A.3.6 Row 2), a receiver should never
send TP.CM_CTS to the global address, so we can add a check in
j1939_can_recv() to drop messages with invalid source address.

Fixes: 9d71dd0c7009 ("can: add support of SAE J1939 protocol")
Link: https://lore.kernel.org/all/1635431907-15617-3-git-send-email-zhangchangzhong@huawei.com
Cc: stable@...r.kernel.org
Signed-off-by: Zhang Changzhong <zhangchangzhong@...wei.com>
Acked-by: Oleksij Rempel <o.rempel@...gutronix.de>
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
---
 net/can/j1939/main.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/net/can/j1939/main.c b/net/can/j1939/main.c
index 9bc55ecb37f9..8452b0fbb78c 100644
--- a/net/can/j1939/main.c
+++ b/net/can/j1939/main.c
@@ -75,6 +75,13 @@ static void j1939_can_recv(struct sk_buff *iskb, void *data)
 	skcb->addr.pgn = (cf->can_id >> 8) & J1939_PGN_MAX;
 	/* set default message type */
 	skcb->addr.type = J1939_TP;
+
+	if (!j1939_address_is_valid(skcb->addr.sa)) {
+		netdev_err_once(priv->ndev, "%s: sa is broadcast address, ignoring!\n",
+				__func__);
+		goto done;
+	}
+
 	if (j1939_pgn_is_pdu1(skcb->addr.pgn)) {
 		/* Type 1: with destination address */
 		skcb->addr.da = skcb->addr.pgn;
-- 
2.33.0