linux-kernel - [PATCH 5.4 04/70] can: j1939: j1939_tp_cmd_recv(): check the dst address of TP.CM

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Message-Id: <20211206145552.061332989@linuxfoundation.org>
Date:   Mon,  6 Dec 2021 15:56:08 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Zhang Changzhong <zhangchangzhong@...wei.com>,
        Oleksij Rempel <o.rempel@...gutronix.de>,
        Marc Kleine-Budde <mkl@...gutronix.de>
Subject: [PATCH 5.4 04/70] can: j1939: j1939_tp_cmd_recv(): check the dst address of TP.CM_BAM

From: Zhang Changzhong <zhangchangzhong@...wei.com>

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@...r.kernel.org
Signed-off-by: Zhang Changzhong <zhangchangzhong@...wei.com>
Acked-by: Oleksij Rempel <o.rempel@...gutronix.de>
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/can/j1939/transport.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/net/can/j1939/transport.c
+++ b/net/can/j1939/transport.c
@@ -2004,6 +2004,12 @@ static void j1939_tp_cmd_recv(struct j19
 		extd = J1939_ETP;
 		/* fall through */
 	case J1939_TP_CMD_BAM: /* fall through */
+		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: /* fall through */
 		if (skcb->addr.type != extd)
 			return;