Staging: line6: fix leaks in line6_probe()

If error occurs line6_probe() must put interface and usbdev that were
got before.
Signed-off-by: Kulikov Vasiliy <segooon@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/line6/driver.c

@@ -679,8 +679,10 @@ static int line6_probe(struct usb_interface *interface, const struct usb_device_
 	usb_get_dev(usbdev);
 
 	/* we don't handle multiple configurations */
-	if (usbdev->descriptor.bNumConfigurations != 1)
-		return -ENODEV;
+	if (usbdev->descriptor.bNumConfigurations != 1) {
+		ret = -ENODEV;
+		goto err_put;
+	}
 
 	/* check vendor and product id */
 	for (devtype = ARRAY_SIZE(line6_id_table) - 1; devtype--;) {
@@ -692,16 +694,20 @@ static int line6_probe(struct usb_interface *interface, const struct usb_device_
 			break;
 	}
 
-	if (devtype < 0)
-		return -ENODEV;
+	if (devtype < 0) {
+		ret = -ENODEV;
+		goto err_put;
+	}
 
 	/* find free slot in device table: */
 	for (devnum = 0; devnum < LINE6_MAX_DEVICES; ++devnum)
 		if (line6_devices[devnum] == NULL)
 			break;
 
-	if (devnum == LINE6_MAX_DEVICES)
-		return -ENODEV;
+	if (devnum == LINE6_MAX_DEVICES) {
+		ret = -ENODEV;
+		goto err_put;
+	}
 
 	/* initialize device info: */
 	properties = &line6_properties_table[devtype];
@@ -762,13 +768,14 @@ static int line6_probe(struct usb_interface *interface, const struct usb_device_
 
 	default:
 		MISSING_CASE;
-		return -ENODEV;
+		ret = -ENODEV;
+		goto err_put;
 	}
 
 	ret = usb_set_interface(usbdev, interface_number, alternate);
 	if (ret < 0) {
 		dev_err(&interface->dev, "set_interface failed\n");
-		return ret;
+		goto err_put;
 	}
 
 	/* initialize device data based on product id: */
@@ -815,7 +822,8 @@ static int line6_probe(struct usb_interface *interface, const struct usb_device_
 			break;
 
 		default:
-			return -ENODEV;
+			ret = -ENODEV;
+			goto err_put;
 		}
 		break;
 
@@ -827,19 +835,22 @@ static int line6_probe(struct usb_interface *interface, const struct usb_device_
 
 	default:
 		MISSING_CASE;
-		return -ENODEV;
+		ret = -ENODEV;
+		goto err_put;
 	}
 
 	if (size == 0) {
 		dev_err(line6->ifcdev, "driver bug: interface data size not set\n");
-		return -ENODEV;
+		ret = -ENODEV;
+		goto err_put;
 	}
 
 	line6 = kzalloc(size, GFP_KERNEL);
 
 	if (line6 == NULL) {
 		dev_err(&interface->dev, "Out of memory\n");
-		return -ENOMEM;
+		ret = -ENODEV;
+		goto err_put;
 	}
 
 	/* store basic data: */
@@ -875,16 +886,16 @@ static int line6_probe(struct usb_interface *interface, const struct usb_device_
 
 		if (line6->buffer_listen == NULL) {
 			dev_err(&interface->dev, "Out of memory\n");
-			line6_destruct(interface);
-			return -ENOMEM;
+			ret = -ENOMEM;
+			goto err_destruct;
 		}
 
 		line6->buffer_message = kmalloc(LINE6_MESSAGE_MAXLEN, GFP_KERNEL);
 
 		if (line6->buffer_message == NULL) {
 			dev_err(&interface->dev, "Out of memory\n");
-			line6_destruct(interface);
-			return -ENOMEM;
+			ret = -ENOMEM;
+			goto err_destruct;
 		}
 
 		line6->urb_listen = usb_alloc_urb(0, GFP_KERNEL);
@@ -892,15 +903,15 @@ static int line6_probe(struct usb_interface *interface, const struct usb_device_
 		if (line6->urb_listen == NULL) {
 			dev_err(&interface->dev, "Out of memory\n");
 			line6_destruct(interface);
-			return -ENOMEM;
+			ret = -ENOMEM;
+			goto err_destruct;
 		}
 
 		ret = line6_start_listen(line6);
 		if (ret < 0) {
 			dev_err(&interface->dev, "%s: usb_submit_urb failed\n",
 				__func__);
-			line6_destruct(interface);
-			return ret;
+			goto err_destruct;
 		}
 	}
 
@@ -952,22 +963,25 @@ static int line6_probe(struct usb_interface *interface, const struct usb_device_
 		ret = -ENODEV;
 	}
 
-	if (ret < 0) {
-		line6_destruct(interface);
-		return ret;
-	}
+	if (ret < 0)
+		goto err_destruct;
 
 	ret = sysfs_create_link(&interface->dev.kobj, &usbdev->dev.kobj,
 				"usb_device");
-	if (ret < 0) {
-		line6_destruct(interface);
-		return ret;
-	}
+	if (ret < 0)
+		goto err_destruct;
 
 	dev_info(&interface->dev, "Line6 %s now attached\n",
 		 line6->properties->name);
 	line6_devices[devnum] = line6;
 	line6_list_devices();
+	return 0;
+
+err_destruct:
+	line6_destruct(interface);
+err_put:
+	usb_put_intf(interface);
+	usb_put_dev(usbdev);
 	return ret;
 }