staging: usbip: vhci: refuse to enqueue for dead connections

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

Signed-off-by: Max Vozeler <max@vozeler.com>
Tested-by: Mark Wehby <MWehby@luxotticaRetail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 13 insertions, 2 deletions

diff --git a/drivers/staging/usbip/vhci_hcd.c b/drivers/staging/usbip/vhci_hcd.c
index 3a22f65b66d0..22b1ad9ebd56 100644
--- 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_hcd *hcd, struct urb *urb,
         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_hcd *hcd, struct urb *urb,
                 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_hcd *hcd, struct urb *urb,
                 __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");