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Staging: usbip: Filtering illegal flags from remote driver

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The usb_submit_urb function in debug mode monitors the bogus flags. The
client driver errors should not be conveyed to the local USB device.

Signed-off-by: Endre Kollar <taxy443@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Endre Kollar 2010-07-27 12:40:00 +02:00 committed by Greg Kroah-Hartman
parent ab30f12d4e
commit b7a937e90c
1 changed files with 55 additions and 0 deletions
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55
drivers/staging/usbip/stub_rx.c
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@ -424,6 +424,60 @@ static int get_pipe(struct stub_device *sdev, int epnum, int dir)
return 0;
}
static void masking_bogus_flags(struct urb *urb)
{
int xfertype;
struct usb_device *dev;
struct usb_host_endpoint *ep;
int is_out;
unsigned int allowed;
if (!urb || urb->hcpriv || !urb->complete)
return;
dev = urb->dev;
if ((!dev) || (dev->state < USB_STATE_UNAUTHENTICATED))
return;
ep = (usb_pipein(urb->pipe) ? dev->ep_in : dev->ep_out)
[usb_pipeendpoint(urb->pipe)];
if (!ep)
return;
xfertype = usb_endpoint_type(&ep->desc);
if (xfertype == USB_ENDPOINT_XFER_CONTROL) {
struct usb_ctrlrequest *setup =
(struct usb_ctrlrequest *) urb->setup_packet;
if (!setup)
return;
is_out = !(setup->bRequestType & USB_DIR_IN) ||
!setup->wLength;
} else {
is_out = usb_endpoint_dir_out(&ep->desc);
}
/* enforce simple/standard policy */
allowed = (URB_NO_TRANSFER_DMA_MAP | URB_NO_SETUP_DMA_MAP |
URB_NO_INTERRUPT | URB_DIR_MASK | URB_FREE_BUFFER);
switch (xfertype) {
case USB_ENDPOINT_XFER_BULK:
if (is_out)
allowed |= URB_ZERO_PACKET;
/* FALLTHROUGH */
case USB_ENDPOINT_XFER_CONTROL:
allowed |= URB_NO_FSBR; /* only affects UHCI */
/* FALLTHROUGH */
default: /* all non-iso endpoints */
if (!is_out)
allowed |= URB_SHORT_NOT_OK;
break;
case USB_ENDPOINT_XFER_ISOC:
allowed |= URB_ISO_ASAP;
break;
}
urb->transfer_flags &= allowed;
}
static void stub_recv_cmd_submit(struct stub_device *sdev,
struct usbip_header *pdu)
{
@ -490,6 +544,7 @@ static void stub_recv_cmd_submit(struct stub_device *sdev,
/* no need to submit an intercepted request, but harmless? */
tweak_special_requests(priv->urb);
masking_bogus_flags(priv->urb);
/* urb is now ready to submit */
ret = usb_submit_urb(priv->urb, GFP_KERNEL);