[PATCH net v2 2/3] can: j1939: j1939_can_recv(): ignore messages with invalid source address
From: Zhang Changzhong <hidden>
Date: 2021-10-28 14:27:12
Also in:
lkml, netdev
Subsystem:
can network layer, can-j1939 network layer, the rest · Maintainers:
Oliver Hartkopp, Marc Kleine-Budde, Robin van der Gracht, Oleksij Rempel, Linus Torvalds
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")
Signed-off-by: Zhang Changzhong <redacted>
---
net/can/j1939/main.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/net/can/j1939/main.c b/net/can/j1939/main.c
index 9bc55ec..461894e 100644
--- a/net/can/j1939/main.c
+++ b/net/can/j1939/main.c@@ -75,6 +75,12 @@ 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;
--
2.9.5