[PATCH 4.17 195/324] net: qrtr: Broadcast messages only from control port

[Greg Kroah-Hartman]

4.17-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Arun Kumar Neelakantam <aneela@xxxxxxxxxxxxxx>

[ Upstream commit fdf5fd3975666804118e62c69de25dc85cc0909c ]

The broadcast node id should only be sent with the control port id.

Signed-off-by: Arun Kumar Neelakantam <aneela@xxxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 net/qrtr/qrtr.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/net/qrtr/qrtr.c
+++ b/net/qrtr/qrtr.c
@@ -764,6 +764,10 @@ static int qrtr_sendmsg(struct socket *s
 	node = NULL;
 	if (addr->sq_node == QRTR_NODE_BCAST) {
 		enqueue_fn = qrtr_bcast_enqueue;
+		if (addr->sq_port != QRTR_PORT_CTRL) {
+			release_sock(sk);
+			return -ENOTCONN;
+		}
 	} else if (addr->sq_node == ipc->us.sq_node) {
 		enqueue_fn = qrtr_local_enqueue;
 	} else {