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From: Andrew Thompson <thompsa@FreeBSD.org>
Date: Wed, 9 Dec 2009 20:15:05 +0000 (UTC)
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Subject: svn commit: r200304 - head/sys/dev/usb/input
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Author: thompsa
Date: Wed Dec  9 20:15:05 2009
New Revision: 200304
URL: http://svn.freebsd.org/changeset/base/200304

Log:
  If the ID byte is non zero then we allow descriptors having multiple sizes.
  
  Submitted by:	HPS
  Reported by:	daichi

Modified:
  head/sys/dev/usb/input/uhid.c

Modified: head/sys/dev/usb/input/uhid.c
==============================================================================
--- head/sys/dev/usb/input/uhid.c	Wed Dec  9 20:05:37 2009	(r200303)
+++ head/sys/dev/usb/input/uhid.c	Wed Dec  9 20:15:05 2009	(r200304)
@@ -173,12 +173,21 @@ uhid_intr_callback(struct usb_xfer *xfer
 		DPRINTF("transferred!\n");
 
 		pc = usbd_xfer_get_frame(xfer, 0);
-		if (actlen >= sc->sc_isize) {
+
+		/* 
+		 * If the ID byte is non zero we allow descriptors
+		 * having multiple sizes:
+		 */
+		if ((actlen >= sc->sc_isize) ||
+		    ((actlen > 0) && (sc->sc_iid != 0))) {
+			/* limit report length to the maximum */
+			if (actlen > sc->sc_isize)
+				actlen = sc->sc_isize;
 			usb_fifo_put_data(sc->sc_fifo.fp[USB_FIFO_RX], pc,
-			    0, sc->sc_isize, 1);
+			    0, actlen, 1);
 		} else {
 			/* ignore it */
-			DPRINTF("ignored short transfer, %d bytes\n", actlen);
+			DPRINTF("ignored transfer, %d bytes\n", actlen);
 		}
 
 	case USB_ST_SETUP: