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Date:   Wed, 27 Jan 2021 00:10:43 +0530
From:   Anant Thazhemadam <anant.thazhemadam@...il.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alan Stern <stern@...land.harvard.edu>,
        Anant Thazhemadam <anant.thazhemadam@...il.com>,
        Bixuan Cui <cuibixuan@...wei.com>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc:     "Zqiang linux-usb @ vger . kernel . org" <qiang.zhang@...driver.com>,
        linux-kernel@...r.kernel.org
Subject: 

Subject: [PATCH v3 12/12] usb: misc: usbtest: update to use the
 usb_control_msg_{send|recv}() API

The newer usb_control_msg_{send|recv}() API are an improvement on the
existing usb_control_msg() as it ensures that a short read/write is treated
as an error, data can be used off the stack, and raw usb pipes need not be
created in the calling functions.
For this reason, instances of usb_control_msg() have been replaced with
usb_control_msg_{recv|send}() and the return value checking conditions have
also been modified appropriately.

Signed-off-by: Anant Thazhemadam <anant.thazhemadam@...il.com>
---
 drivers/usb/misc/usbtest.c | 69 ++++++++++++++++----------------------
 1 file changed, 29 insertions(+), 40 deletions(-)

diff --git a/drivers/usb/misc/usbtest.c b/drivers/usb/misc/usbtest.c
index 150090ee4ec1..4337eff2a749 100644
--- a/drivers/usb/misc/usbtest.c
+++ b/drivers/usb/misc/usbtest.c
@@ -672,19 +672,15 @@ static int get_altsetting(struct usbtest_dev *dev)
 	struct usb_device	*udev = interface_to_usbdev(iface);
 	int			retval;
 
-	retval = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
-			USB_REQ_GET_INTERFACE, USB_DIR_IN|USB_RECIP_INTERFACE,
-			0, iface->altsetting[0].desc.bInterfaceNumber,
-			dev->buf, 1, USB_CTRL_GET_TIMEOUT);
-	switch (retval) {
-	case 1:
-		return dev->buf[0];
-	case 0:
-		retval = -ERANGE;
-		fallthrough;
-	default:
+	retval = usb_control_msg_recv(udev, 0, USB_REQ_GET_INTERFACE,
+				      USB_DIR_IN|USB_RECIP_INTERFACE,
+				      0, iface->altsetting[0].desc.bInterfaceNumber,
+				      dev->buf, 1, USB_CTRL_GET_TIMEOUT, GFP_KERNEL);
+
+	if (retval < 0)
 		return retval;
-	}
+
+	return dev->buf[0];
 }
 
 static int set_altsetting(struct usbtest_dev *dev, int alternate)
@@ -872,14 +868,15 @@ static int ch9_postconfig(struct usbtest_dev *dev)
 		 * ... although some cheap devices (like one TI Hub I've got)
 		 * won't return config descriptors except before set_config.
 		 */
-		retval = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
-				USB_REQ_GET_CONFIGURATION,
-				USB_DIR_IN | USB_RECIP_DEVICE,
-				0, 0, dev->buf, 1, USB_CTRL_GET_TIMEOUT);
-		if (retval != 1 || dev->buf[0] != expected) {
+		retval = usb_control_msg_recv(udev, 0, USB_REQ_GET_CONFIGURATION,
+					      USB_DIR_IN | USB_RECIP_DEVICE,  0,
+					      0, dev->buf, 1, USB_CTRL_GET_TIMEOUT,
+					      GFP_KERNEL);
+
+		if (retval != 0 || dev->buf[0] != expected) {
 			dev_err(&iface->dev, "get config --> %d %d (1 %d)\n",
 				retval, dev->buf[0], expected);
-			return (retval < 0) ? retval : -EDOM;
+			return retval;
 		}
 	}
 
@@ -1683,10 +1680,10 @@ static int test_halt(struct usbtest_dev *tdev, int ep, struct urb *urb)
 		return retval;
 
 	/* set halt (protocol test only), verify it worked */
-	retval = usb_control_msg(urb->dev, usb_sndctrlpipe(urb->dev, 0),
-			USB_REQ_SET_FEATURE, USB_RECIP_ENDPOINT,
-			USB_ENDPOINT_HALT, ep,
-			NULL, 0, USB_CTRL_SET_TIMEOUT);
+	retval = usb_control_msg_send(urb->dev, 0, USB_REQ_SET_FEATURE,
+				      USB_RECIP_ENDPOINT, USB_ENDPOINT_HALT,
+				      ep, NULL, 0, USB_CTRL_SET_TIMEOUT,
+				      GFP_KERNEL);
 	if (retval < 0) {
 		ERROR(tdev, "ep %02x couldn't set halt, %d\n", ep, retval);
 		return retval;
@@ -1845,30 +1842,22 @@ static int ctrl_out(struct usbtest_dev *dev,
 		/* write patterned data */
 		for (j = 0; j < len; j++)
 			buf[j] = (u8)(i + j);
-		retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
-				0x5b, USB_DIR_OUT|USB_TYPE_VENDOR,
-				0, 0, buf, len, USB_CTRL_SET_TIMEOUT);
-		if (retval != len) {
+		retval = usb_control_msg_send(udev, 0, 0x5b,
+					      USB_DIR_OUT | USB_TYPE_VENDOR, 0,
+					      0, buf, len, USB_CTRL_SET_TIMEOUT,
+					      GFP_KERNEL);
+		if (retval < 0) {
 			what = "write";
-			if (retval >= 0) {
-				ERROR(dev, "ctrl_out, wlen %d (expected %d)\n",
-						retval, len);
-				retval = -EBADMSG;
-			}
 			break;
 		}
 
 		/* read it back -- assuming nothing intervened!!  */
-		retval = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
-				0x5c, USB_DIR_IN|USB_TYPE_VENDOR,
-				0, 0, buf, len, USB_CTRL_GET_TIMEOUT);
-		if (retval != len) {
+		retval = usb_control_msg_recv(udev, 0,
+					      0x5c, USB_DIR_IN|USB_TYPE_VENDOR,
+					      0, 0, buf, len, USB_CTRL_GET_TIMEOUT,
+					      GFP_KERNEL);
+		if (retval < 0) {
 			what = "read";
-			if (retval >= 0) {
-				ERROR(dev, "ctrl_out, rlen %d (expected %d)\n",
-						retval, len);
-				retval = -EBADMSG;
-			}
 			break;
 		}
 
-- 
2.25.1