linux-kernel - [PATCH 3.12 083/142] ACM gadget: fix endianness in notifications

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Date:   Mon, 10 Apr 2017 17:32:44 +0200
From:   Jiri Slaby <jslaby@...e.cz>
To:     stable@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Oliver Neukum <oneukum@...e.com>,
        Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 083/142] ACM gadget: fix endianness in notifications

From: Oliver Neukum <oneukum@...e.com>

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

===============

commit cdd7928df0d2efaa3270d711963773a08a4cc8ab upstream.

The gadget code exports the bitfield for serial status changes
over the wire in its internal endianness. The fix is to convert
to little endian before sending it over the wire.

Signed-off-by: Oliver Neukum <oneukum@...e.com>
Tested-by: 家瑋 <momo1208@...il.com>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 drivers/usb/gadget/f_acm.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/gadget/f_acm.c b/drivers/usb/gadget/f_acm.c
index 3384486c2884..ff30171b6926 100644
--- a/drivers/usb/gadget/f_acm.c
+++ b/drivers/usb/gadget/f_acm.c
@@ -535,13 +535,15 @@ static int acm_notify_serial_state(struct f_acm *acm)
 {
 	struct usb_composite_dev *cdev = acm->port.func.config->cdev;
 	int			status;
+	__le16			serial_state;
 
 	spin_lock(&acm->lock);
 	if (acm->notify_req) {
 		DBG(cdev, "acm ttyGS%d serial state %04x\n",
 				acm->port_num, acm->serial_state);
+		serial_state = cpu_to_le16(acm->serial_state);
 		status = acm_cdc_notify(acm, USB_CDC_NOTIFY_SERIAL_STATE,
-				0, &acm->serial_state, sizeof(acm->serial_state));
+				0, &serial_state, sizeof(acm->serial_state));
 	} else {
 		acm->pending = true;
 		status = 0;
-- 
2.12.2