[PATCH 4.19 49/77] usb: usbip: vhci_hcd: protect shift size

[Greg Kroah-Hartman]

From: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>

commit 718bf42b119de652ebcc93655a1f33a9c0d04b3c upstream.

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 <rdunlap@xxxxxxxxxxxxx>
Reported-by: syzbot+297d20e437b79283bf6d@xxxxxxxxxxxxxxxxxxxxxxxxx
Cc: Yuyang Du <yuyang.du@xxxxxxxxx>
Cc: Shuah Khan <shuahkh@xxxxxxxxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: linux-usb@xxxxxxxxxxxxxxx
Cc: stable <stable@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20201229071309.18418-1-rdunlap@xxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/usb/usbip/vhci_hcd.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/usb/usbip/vhci_hcd.c
+++ b/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;
 		}