# \[PATCH net v2 1/3\] can: j1939: j1939\_tp\_cmd\_recv(): ignore abort message in the BAM transport

- From: Zhang Changzhong \<hidden\>
- Date: 2021-10-28 14:27:21 
- List: netdev
- Page: https://ratatoskr.run/netdev/2021/10/1556978
- Thread: https://ratatoskr.run/linux-can/2021/10/1556976/t.md

```text
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")
Signed-off-by: Zhang Changzhong <redacted>
---
 net/can/j1939/transport.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/net/can/j1939/transport.c b/net/can/j1939/transport.c
index 6c0a0eb..05eb3d0 100644
--- a/net/can/j1939/transport.c
+++ b/net/can/j1939/transport.c
@@ -2085,6 +2085,12 @@ static void j1939_tp_cmd_recv(struct j1939_priv *priv, struct sk_buff *skb)
 		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);
 
-- 
2.9.5

```