usbip: fix stub_rx: harden CMD_SUBMIT path to handle malicious input

commit c6688ef upstream.

Harden CMD_SUBMIT path to handle malicious input that could trigger
large memory allocations. Add checks to validate transfer_buffer_length
and number_of_packets to protect against bad input requesting for
unbounded memory allocations. Validate early in get_pipe() and return
failure.

Reported-by: Secunia Research <vuln@secunia.com>
Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[bwh: Backported to 3.2:
 - Device for logging purposes is &sdev->interface->dev
 - Adjust filename, context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

drivers/staging/usbip/stub_rx.c

@@ -350,11 +350,13 @@ static struct stub_priv *stub_priv_alloc(struct stub_device *sdev,
 	return priv;
 }
 
-static int get_pipe(struct stub_device *sdev, int epnum, int dir)
+static int get_pipe(struct stub_device *sdev, struct usbip_header *pdu)
 {
 	struct usb_device *udev = sdev->udev;
 	struct usb_host_endpoint *ep;
 	struct usb_endpoint_descriptor *epd = NULL;
+	int epnum = pdu->base.ep;
+	int dir = pdu->base.direction;
 
 	if (epnum < 0 || epnum > 15)
 		goto err_ret;
@@ -367,6 +369,15 @@ static int get_pipe(struct stub_device *sdev, int epnum, int dir)
 		goto err_ret;
 
 	epd = &ep->desc;
+
+	/* validate transfer_buffer_length */
+	if (pdu->u.cmd_submit.transfer_buffer_length > INT_MAX) {
+		dev_err(&sdev->interface->dev,
+			"CMD_SUBMIT: -EMSGSIZE transfer_buffer_length %d\n",
+			pdu->u.cmd_submit.transfer_buffer_length);
+		return -1;
+	}
+
 	if (usb_endpoint_xfer_control(epd)) {
 		if (dir == USBIP_DIR_OUT)
 			return usb_sndctrlpipe(udev, epnum);
@@ -389,6 +400,21 @@ static int get_pipe(struct stub_device *sdev, int epnum, int dir)
 	}
 
 	if (usb_endpoint_xfer_isoc(epd)) {
+		/* validate packet size and number of packets */
+		unsigned int maxp, packets, bytes;
+
+		maxp = usb_endpoint_maxp(epd);
+		maxp *= usb_endpoint_maxp_mult(epd);
+		bytes = pdu->u.cmd_submit.transfer_buffer_length;
+		packets = DIV_ROUND_UP(bytes, maxp);
+
+		if (pdu->u.cmd_submit.number_of_packets < 0 ||
+		    pdu->u.cmd_submit.number_of_packets > packets) {
+			dev_err(&sdev->interface->dev,
+				"CMD_SUBMIT: isoc invalid num packets %d\n",
+				pdu->u.cmd_submit.number_of_packets);
+			return -1;
+		}
 		if (dir == USBIP_DIR_OUT)
 			return usb_sndisocpipe(udev, epnum);
 		else
@@ -397,7 +423,7 @@ static int get_pipe(struct stub_device *sdev, int epnum, int dir)
 
 err_ret:
 	/* NOT REACHED */
-	dev_err(&sdev->interface->dev, "get pipe() invalid epnum %d\n", epnum);
+	dev_err(&sdev->interface->dev, "CMD_SUBMIT: invalid epnum %d\n", epnum);
 	return -1;
 }
 
@@ -462,7 +488,7 @@ static void stub_recv_cmd_submit(struct stub_device *sdev,
 	struct stub_priv *priv;
 	struct usbip_device *ud = &sdev->ud;
 	struct usb_device *udev = sdev->udev;
-	int pipe = get_pipe(sdev, pdu->base.ep, pdu->base.direction);
+	int pipe = get_pipe(sdev, pdu);
 
 	if (pipe == -1)
 		return;
@@ -485,7 +511,8 @@ static void stub_recv_cmd_submit(struct stub_device *sdev,
 	}
 
 	/* set priv->urb->transfer_buffer */
-	if (pdu->u.cmd_submit.transfer_buffer_length > 0) {
+	if (pdu->u.cmd_submit.transfer_buffer_length > 0 &&
+	    pdu->u.cmd_submit.transfer_buffer_length <= INT_MAX) {
 		priv->urb->transfer_buffer =
 			kzalloc(pdu->u.cmd_submit.transfer_buffer_length,
 				GFP_KERNEL);