USB: check the endpoint type against the pipe type

This patch (as1316) adds some error checking to usb_submit_urb().
It's conditional on CONFIG_USB_DEBUG, so it won't affect normal users.
The new check makes sure that the actual type of the endpoint
described by urb->pipe agrees with the type encoded in the pipe value.

The USB error code documentation is updated to include the code
returned by the new check, and the usbfs SUBMITURB handler is updated
to use the correct pipe type when legacy user code tries to submit a
bulk transfer to an interrupt endpoint.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

3 files changed, 24 insertions, 11 deletions

diff --git a/Documentation/usb/error-codes.txt b/Documentation/usb/error-codes.txt
index 9cf83e8..d83703e 100644
--- a/Documentation/usb/error-codes.txt
+++ b/Documentation/usb/error-codes.txt
@@ -41,8 +41,8 @@ USB-specific:
 
 -EFBIG		Host controller driver can't schedule that many ISO frames.
 
--EPIPE		Specified endpoint is stalled.  For non-control endpoints,
-		reset this status with usb_clear_halt().
+-EPIPE		The pipe type specified in the URB doesn't match the
+		endpoint's actual type.
 
 -EMSGSIZE	(a) endpoint maxpacket size is zero; it is not usable
 		    in the current interface altsetting.
@@ -60,6 +60,8 @@ USB-specific:
 
 -EHOSTUNREACH	URB was rejected because the device is suspended.
 
+-ENOEXEC	A control URB doesn't contain a Setup packet.
+
 
 **************************************************************************
 *                   Error codes returned by in urb->status               *
diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c
index a678186..431d172 100644
--- a/drivers/usb/core/devio.c
+++ b/drivers/usb/core/devio.c
@@ -1104,13 +1104,25 @@ static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
 		case USB_ENDPOINT_XFER_CONTROL:
 		case USB_ENDPOINT_XFER_ISOC:
 			return -EINVAL;
-		/* allow single-shot interrupt transfers, at bogus rates */
+		case USB_ENDPOINT_XFER_INT:
+			/* allow single-shot interrupt transfers */
+			uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
+			goto interrupt_urb;
 		}
 		uurb->number_of_packets = 0;
 		if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
 			return -EINVAL;
 		break;
 
+	case USBDEVFS_URB_TYPE_INTERRUPT:
+		if (!usb_endpoint_xfer_int(&ep->desc))
+			return -EINVAL;
+ interrupt_urb:
+		uurb->number_of_packets = 0;
+		if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
+			return -EINVAL;
+		break;
+
 	case USBDEVFS_URB_TYPE_ISO:
 		/* arbitrary limit */
 		if (uurb->number_of_packets < 1 ||
@@ -1143,14 +1155,6 @@ static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
 		uurb->buffer_length = totlen;
 		break;
 
-	case USBDEVFS_URB_TYPE_INTERRUPT:
-		uurb->number_of_packets = 0;
-		if (!usb_endpoint_xfer_int(&ep->desc))
-			return -EINVAL;
-		if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
-			return -EINVAL;
-		break;
-
 	default:
 		return -EINVAL;
 	}
diff --git a/drivers/usb/core/urb.c b/drivers/usb/core/urb.c
index e7cae13..e2bd153 100644
--- a/drivers/usb/core/urb.c
+++ b/drivers/usb/core/urb.c
@@ -387,6 +387,13 @@ int usb_submit_urb(struct urb *urb, gfp_t mem_flags)
 	{
 	unsigned int	orig_flags = urb->transfer_flags;
 	unsigned int	allowed;
+	static int pipetypes[4] = {
+		PIPE_CONTROL, PIPE_ISOCHRONOUS, PIPE_BULK, PIPE_INTERRUPT
+	};
+
+	/* Check that the pipe's type matches the endpoint's type */
+	if (usb_pipetype(urb->pipe) != pipetypes[xfertype])
+		return -EPIPE;		/* The most suitable error code :-) */
 
 	/* enforce simple/standard policy */
 	allowed = (URB_NO_TRANSFER_DMA_MAP | URB_NO_SETUP_DMA_MAP |