From 994246f7c6742555aee899ed853a91bc77686022 Mon Sep 17 00:00:00 2001
From: ZhongYao Luo <LuoZhongYao@gmail.com>
Date: Tue, 3 Dec 2019 17:33:07 +0800
Subject: [PATCH] bluetooth: h5:  Handling the the zero length ack packet

If H5_HDR_LEN is equal to zero, remaining will grow
negatively, the commit fixes the problem.

Signed-off-by: ZhongYao Luo <LuoZhongYao@gmail.com>
---
 drivers/bluetooth/hci/h5.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/bluetooth/hci/h5.c b/drivers/bluetooth/hci/h5.c
index a38ccc5b2b2..bab17b87c28 100644
--- a/drivers/bluetooth/hci/h5.c
+++ b/drivers/bluetooth/hci/h5.c
@@ -501,6 +501,9 @@ static void bt_uart_isr(struct device *unused)
 				h5.rx_state = END;
 				break;
 			}
+			if (!remaining) {
+				h5.rx_state = END;
+			}
 			break;
 		case PAYLOAD:
 			if (h5_unslip_byte(&byte) < 0) {