[PATCH] usb: usbip: vhci_hcd: protect shift size

[Randy Dunlap]

Fix shift out-of-bounds in vhci_hcd.c:

  UBSAN: shift-out-of-bounds in ../drivers/usb/usbip/vhci_hcd.c:399:41
  shift exponent 768 is too large for 32-bit type 'int'

Fixes: 03cd00d538a6 ("usbip: vhci-hcd: Set the vhci structure up to work")
Signed-off-by: Randy Dunlap <rdun...@infradead.org>
Reported-by: syzbot+297d20e437b79283b...@syzkaller.appspotmail.com
Cc: Yuyang Du <yuyang...@intel.com>
Cc: Shuah Khan <shua...@osg.samsung.com>
Cc: Greg Kroah-Hartman <gre...@linuxfoundation.org>
Cc: linux-...@vger.kernel.org
---
 drivers/usb/usbip/vhci_hcd.c |    2 ++
 1 file changed, 2 insertions(+)

--- linux-5.10.orig/drivers/usb/usbip/vhci_hcd.c
+++ linux-5.10/drivers/usb/usbip/vhci_hcd.c
@@ -396,6 +396,8 @@ static int vhci_hub_control(struct usb_h
                default:
                        usbip_dbg_vhci_rh(" ClearPortFeature: default %x\n",
                                          wValue);
+                       if (wValue >= 32)
+                               goto error;
                        vhci_hcd->port_status[rhport] &= ~(1 << wValue);
                        break;
                }