diff options
author | Zhang Changzhong <zhangchangzhong@huawei.com> | 2021-10-28 17:38:27 +0300 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-11-18 21:16:03 +0300 |
commit | 24d8a24f5641a32600cc203ae87260b1dfab448d (patch) | |
tree | 7729d9eecf15ab008725460c8ccc94ad62b6f433 /net/can/j1939/transport.c | |
parent | e35f3d74bf06fdd302d8308799b1804d7be543df (diff) | |
download | linux-24d8a24f5641a32600cc203ae87260b1dfab448d.tar.xz |
can: j1939: j1939_tp_cmd_recv(): check the dst address of TP.CM_BAM
commit 164051a6ab5445bd97f719f50b16db8b32174269 upstream.
The TP.CM_BAM message must be sent to the global address [1], so add a
check to drop TP.CM_BAM sent to a non-global address.
Without this patch, the receiver will treat the following packets as
normal RTS/CTS transport:
18EC0102#20090002FF002301
18EB0102#0100000000000000
18EB0102#020000FFFFFFFFFF
[1] SAE-J1939-82 2015 A.3.3 Row 1.
Fixes: 9d71dd0c7009 ("can: add support of SAE J1939 protocol")
Link: https://lore.kernel.org/all/1635431907-15617-4-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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net/can/j1939/transport.c')
-rw-r--r-- | net/can/j1939/transport.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/net/can/j1939/transport.c b/net/can/j1939/transport.c index 05eb3d059e17..a271688780a2 100644 --- a/net/can/j1939/transport.c +++ b/net/can/j1939/transport.c @@ -2023,6 +2023,11 @@ static void j1939_tp_cmd_recv(struct j1939_priv *priv, struct sk_buff *skb) extd = J1939_ETP; fallthrough; case J1939_TP_CMD_BAM: + if (cmd == J1939_TP_CMD_BAM && !j1939_cb_is_broadcast(skcb)) { + netdev_err_once(priv->ndev, "%s: BAM to unicast (%02x), ignoring!\n", + __func__, skcb->addr.sa); + return; + } fallthrough; case J1939_TP_CMD_RTS: if (skcb->addr.type != extd) |