linux-kernel - [PATCH 3.16 184/366] usbip: vhci_hcd: check rhport before using in vhci_hub

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Message-ID: <lsq.1539530741.634284374@decadent.org.uk>
Date:   Sun, 14 Oct 2018 16:25:41 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
        "Shuah Khan" <shuahkh@....samsung.com>
Subject: [PATCH 3.16 184/366] usbip: vhci_hcd: check rhport before using
 in vhci_hub_control()

3.16.60-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Shuah Khan <shuahkh@....samsung.com>

commit 5b22f676118ff25049382041da0db8012e57c9e8 upstream.

Validate !rhport < 0 before using it to access port_status array.

Signed-off-by: Shuah Khan <shuahkh@....samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
[bwh: Backported to 3.16:
 - Drop changes to the SetPortFeature
   USB_PORT_FEAT_{SUSPEND,POWER,BH_PORT_RESET} cases
 - Add the "error" label
 - Adjust filename, context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
--- a/drivers/staging/usbip/vhci_hcd.c
+++ b/drivers/staging/usbip/vhci_hcd.c
@@ -266,6 +266,8 @@ static int vhci_hub_control(struct usb_h
 		usbip_dbg_vhci_rh(" ClearHubFeature\n");
 		break;
 	case ClearPortFeature:
+		if (rhport < 0)
+			goto error;
 		switch (wValue) {
 		case USB_PORT_FEAT_SUSPEND:
 			if (dum->port_status[rhport] & USB_PORT_STAT_SUSPEND) {
@@ -370,6 +372,8 @@ static int vhci_hub_control(struct usb_h
 		case USB_PORT_FEAT_RESET:
 			usbip_dbg_vhci_rh(
 				" SetPortFeature: USB_PORT_FEAT_RESET\n");
+			if (rhport < 0)
+				goto error;
 			/* if it's already running, disconnect first */
 			if (dum->port_status[rhport] & USB_PORT_STAT_ENABLE) {
 				dum->port_status[rhport] &=
@@ -385,6 +389,8 @@ static int vhci_hub_control(struct usb_h
 		default:
 			usbip_dbg_vhci_rh(" SetPortFeature: default %d\n",
 					  wValue);
+			if (rhport < 0)
+				goto error;
 			dum->port_status[rhport] |= (1 << wValue);
 			break;
 		}
@@ -392,7 +398,7 @@ static int vhci_hub_control(struct usb_h
 
 	default:
 		pr_err("default: no such request\n");
-
+error:
 		/* "protocol stall" on error */
 		retval = -EPIPE;
 	}