From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org,
        Zhang Changzhong <zhangchangzhong@huawei.com>,
        Oleksij Rempel <o.rempel@pengutronix.de>,
        Marc Kleine-Budde <mkl@pengutronix.de>
Subject: [PATCH 5.4 091/355] can: j1939: j1939_tp_cmd_recv(): ignore abort message in the BAM transport
Date:   Mon, 15 Nov 2021 18:00:15 +0100
Message-Id: <20211115165316.745896063@linuxfoundation.org>
In-Reply-To: <20211115165313.549179499@linuxfoundation.org>
References: <20211115165313.549179499@linuxfoundation.org>
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From: Zhang Changzhong <zhangchangzhong@huawei.com>

commit c0f49d98006f2db3333b917caac65bce2af9865c upstream.

This patch prevents BAM transport from being closed by receiving abort
message, as specified in SAE-J1939-82 2015 (A.3.3 Row 4).

Fixes: 9d71dd0c7009 ("can: add support of SAE J1939 protocol")
Link: https://lore.kernel.org/all/1635431907-15617-2-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>
---
 net/can/j1939/transport.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/net/can/j1939/transport.c
+++ b/net/can/j1939/transport.c
@@ -2065,6 +2065,12 @@ static void j1939_tp_cmd_recv(struct j19
 		break;
 
 	case J1939_ETP_CMD_ABORT: /* && J1939_TP_CMD_ABORT */
+		if (j1939_cb_is_broadcast(skcb)) {
+			netdev_err_once(priv->ndev, "%s: abort to broadcast (%02x), ignoring!\n",
+					__func__, skcb->addr.sa);
+			return;
+		}
+
 		if (j1939_tp_im_transmitter(skcb))
 			j1939_xtp_rx_abort(priv, skb, true);