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Subject[PATCH] usb: usbip: vhci_hcd: protect shift size
Date
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@infradead.org>
Reported-by: syzbot+297d20e437b79283bf6d@syzkaller.appspotmail.com
Cc: Yuyang Du <yuyang.du@intel.com>
Cc: Shuah Khan <shuahkh@osg.samsung.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: linux-usb@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;
}
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