From ab00f89fdff61975fa52a61608080ea7b8d8e800 Mon Sep 17 00:00:00 2001 From: Dean Jenkins Date: Fri, 28 Apr 2017 13:57:24 +0100 Subject: [PATCH] Bluetooth: hci_ldisc: Add protocol check to hci_uart_send_frame() Before attempting to send a HCI message, check that the Data Link protocol is still bound to the HCI UART driver. This makes the code consistent with the usage of the other proto function pointers. Therefore, add a check for HCI_UART_PROTO_READY into hci_uart_send_frame() and return -EUNATCH if the Data Link protocol is not bound. This also allows hci_send_frame() to report the error of an unbound Data Link protocol layer. Therefore, it assists with diagnostics into why HCI messages are being sent when the Data Link protocol is not bound and avoids potential crashes. Signed-off-by: Dean Jenkins Signed-off-by: Marcel Holtmann --- drivers/bluetooth/hci_ldisc.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/bluetooth/hci_ldisc.c b/drivers/bluetooth/hci_ldisc.c index c53513c..c515aa9 100644 --- a/drivers/bluetooth/hci_ldisc.c +++ b/drivers/bluetooth/hci_ldisc.c @@ -256,6 +256,9 @@ static int hci_uart_send_frame(struct hci_dev *hdev, struct sk_buff *skb) BT_DBG("%s: type %d len %d", hdev->name, hci_skb_pkt_type(skb), skb->len); + if (!test_bit(HCI_UART_PROTO_READY, &hu->flags)) + return -EUNATCH; + hu->proto->enqueue(hu, skb); hci_uart_tx_wakeup(hu); -- 2.7.4