linux-kernel - [PATCH 4.19 43/56] usbip: vhci_hcd fix shift out-of-bounds in vhci_hub

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Date:   Mon,  5 Apr 2021 10:54:14 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        syzbot+3dea30b047f41084de66@...kaller.appspotmail.com,
        Shuah Khan <skhan@...uxfoundation.org>
Subject: [PATCH 4.19 43/56] usbip: vhci_hcd fix shift out-of-bounds in vhci_hub_control()

From: Shuah Khan <skhan@...uxfoundation.org>

commit 1cc5ed25bdade86de2650a82b2730108a76de20c upstream.

Fix shift out-of-bounds in vhci_hub_control() SetPortFeature handling.

UBSAN: shift-out-of-bounds in drivers/usb/usbip/vhci_hcd.c:605:42
shift exponent 768 is too large for 32-bit type 'int'

Reported-by: syzbot+3dea30b047f41084de66@...kaller.appspotmail.com
Cc: stable@...r.kernel.org
Signed-off-by: Shuah Khan <skhan@...uxfoundation.org>
Link: https://lore.kernel.org/r/20210324230654.34798-1-skhan@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 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
@@ -594,6 +594,8 @@ static int vhci_hub_control(struct usb_h
 				pr_err("invalid port number %d\n", wIndex);
 				goto error;
 			}
+			if (wValue >= 32)
+				goto error;
 			if (hcd->speed == HCD_USB3) {
 				if ((vhci_hcd->port_status[rhport] &
 				     USB_SS_PORT_STAT_POWER) != 0) {