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>
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 @@
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 @@
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 @@
{
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 |