HID: usbhid: add safety check at _report

Add device disconnect check in usbhid_get_raw_report()

Bug 200000762

Change-Id: Ia56a5ba746ee197a0be967f4cb09e38e44be8a8f
Signed-off-by: Vinayak Pane <vpane@nvidia.com>
Reviewed-on: http://git-master/r/404650
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Tao Xie <txie@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Thomas Cherry <tcherry@nvidia.com>

drivers/hid/usbhid/hid-core.c

@@ -908,12 +908,21 @@ static int usbhid_get_raw_report(struct hid_device *hid,
 		unsigned char report_type)
 {
 	struct usbhid_device *usbhid = hid->driver_data;
-	struct usb_device *dev = hid_to_usb_dev(hid);
-	struct usb_interface *intf = usbhid->intf;
-	struct usb_host_interface *interface = intf->cur_altsetting;
+	struct usb_device *dev;
+	struct usb_interface *intf;
+	struct usb_host_interface *interface;
 	int skipped_report_id = 0;
 	int ret;
 
+	if (test_bit(HID_DISCONNECTED, &usbhid->iofl)) {
+		pr_err("hid device disconnected\n");
+		return -ESHUTDOWN;
+	}
+
+	dev = hid_to_usb_dev(hid);
+	intf = usbhid->intf;
+	interface = intf->cur_altsetting;
+
 	/* Byte 0 is the report number. Report data starts at byte 1.*/
 	buf[0] = report_number;
 	if (report_number == 0x0) {