diff options
| author | Zhang Changzhong <zhangchangzhong@huawei.com> | 2021-10-28 22:38:26 +0800 |
|---|---|---|
| committer | Marc Kleine-Budde <mkl@pengutronix.de> | 2021-11-06 17:29:24 +0100 |
| commit | a79305e156db3d24fcd8eb649cdb3c3b2350e5c2 (patch) | |
| tree | dfa72eff682fe57d5bf1892986b557b64361903e /net/can | |
| parent | c0f49d98006f2db3333b917caac65bce2af9865c (diff) | |
| download | lwn-a79305e156db3d24fcd8eb649cdb3c3b2350e5c2.tar.gz lwn-a79305e156db3d24fcd8eb649cdb3c3b2350e5c2.zip | |
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>
Diffstat (limited to 'net/can')
| -rw-r--r-- | net/can/j1939/main.c | 7 |
1 files changed, 7 insertions, 0 deletions
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; |