[PATCH v1 12/25] j1939: socket: prevent sending broadcast message without the SO_BROADCAST flag.

[Oleksij Rempel <o.rempel@xxxxxxxxxxxxxx>]

to sync the behavior with ip(7) man page.

Signed-off-by: Oleksij Rempel <o.rempel@xxxxxxxxxxxxxx>
---
 net/can/j1939/socket.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/net/can/j1939/socket.c b/net/can/j1939/socket.c
index ca85fbce7556..6d09d44c539d 100644
--- a/net/can/j1939/socket.c
+++ b/net/can/j1939/socket.c
@@ -751,6 +751,11 @@ static int j1939_sk_sendmsg(struct socket *sock, struct msghdr *msg,
 		/* no address assigned yet */
 		return -EBADFD;
 
+	if (jsk->addr.da == J1939_NO_ADDR && !jsk->addr.dst_name &&
+	    !sock_flag(sk, SOCK_BROADCAST))
+		/* broadcast, but SO_BROADCAST not set */
+		return -EACCES;
+
 	/* deal with provided address info */
 	if (msg->msg_name) {
 		struct sockaddr_can *addr = msg->msg_name;
-- 
2.20.1