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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: 9d71dd0c70 ("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>
This commit is contained in:
Zhang Changzhong 2021-10-28 22:38:26 +08:00 committed by Marc Kleine-Budde
parent c0f49d9800
commit a79305e156
1 changed files with 7 additions and 0 deletions
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7
net/can/j1939/main.c
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@ -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;