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From: Randy Dunlap <rdunlap@infradead.org>
To: linux-kernel@vger.kernel.org
Cc: Randy Dunlap <rdunlap@infradead.org>,
	syzbot+297d20e437b79283bf6d@syzkaller.appspotmail.com,
	Yuyang Du <yuyang.du@intel.com>,
	Shuah Khan <shuahkh@osg.samsung.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	linux-usb@vger.kernel.org
Subject: [PATCH] usb: usbip: vhci_hcd: protect shift size
Date: Mon, 28 Dec 2020 23:13:09 -0800
Message-ID: <20201229071309.18418-1-rdunlap@infradead.org> (raw)

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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