can: j1939: j1939_can_recv(): ignore messages with invalid source address

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@vger.kernel.org
Signed-off-by: Zhang Changzhong <zhangchangzhong@huawei.com>
Acked-by: Oleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

diff --git a/net/can/j1939/main.c b/net/can/j1939/main.c
index 9bc55ecb37f9fafa751e46d4a6914b9f05d0f805..8452b0fbb78c9a4b327fbb0f998d2df0eab12495 100644 (file)
--- 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;