linux-kernel - [16/73] staging: usbip: vhci: refuse to enqueue for dead connections

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Date:	Fri, 04 Mar 2011 16:55:21 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Max Vozeler <max@...eler.com>
Subject: [16/73] staging: usbip: vhci: refuse to enqueue for dead connections

2.6.37-stable review patch.  If anyone has any objections, please let us know.

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

From: Max Vozeler <max@...eler.com>

commit 6d212153a838354078cc7d96f9bb23b7d1fd3d1b upstream.

There can be requests to enqueue URBs while we are shutting
down a connection.

Signed-off-by: Max Vozeler <max@...eler.com>
Tested-by: Mark Wehby <MWehby@...otticaRetail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/staging/usbip/vhci_hcd.c |   15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

--- a/drivers/staging/usbip/vhci_hcd.c
+++ b/drivers/staging/usbip/vhci_hcd.c
@@ -559,6 +559,7 @@ static int vhci_urb_enqueue(struct usb_h
 	struct device *dev = &urb->dev->dev;
 	int ret = 0;
 	unsigned long flags;
+	struct vhci_device *vdev;
 
 	usbip_dbg_vhci_hc("enter, usb_hcd %p urb %p mem_flags %d\n",
 		    hcd, urb, mem_flags);
@@ -574,6 +575,18 @@ static int vhci_urb_enqueue(struct usb_h
 		return urb->status;
 	}
 
+	vdev = port_to_vdev(the_controller->pending_port);
+
+	/* refuse enqueue for dead connection */
+	spin_lock(&vdev->ud.lock);
+	if (vdev->ud.status == VDEV_ST_NULL || vdev->ud.status == VDEV_ST_ERROR) {
+		usbip_uerr("enqueue for inactive port %d\n", vdev->rhport);
+		spin_unlock(&vdev->ud.lock);
+		spin_unlock_irqrestore(&the_controller->lock, flags);
+		return -ENODEV;
+	}
+	spin_unlock(&vdev->ud.lock);
+
 	ret = usb_hcd_link_urb_to_ep(hcd, urb);
 	if (ret)
 		goto no_need_unlink;
@@ -592,8 +605,6 @@ static int vhci_urb_enqueue(struct usb_h
 		__u8 type = usb_pipetype(urb->pipe);
 		struct usb_ctrlrequest *ctrlreq =
 				(struct usb_ctrlrequest *) urb->setup_packet;
-		struct vhci_device *vdev =
-				port_to_vdev(the_controller->pending_port);
 
 		if (type != PIPE_CONTROL || !ctrlreq) {
 			dev_err(dev, "invalid request to devnum 0\n");


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