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 diff -rp -u4 libusb-1.0.19-orig/libusb/descriptor.c libusb-1.0.19/libusb/descriptor.c
--- libusb-1.0.19-orig/libusb/descriptor.c	2015-05-12 00:15:19 +0200
+++ libusb-1.0.19/libusb/descriptor.c	2015-05-12 00:17:09 +0200
@@ -1181,9 +1181,9 @@ int API_EXPORTED libusb_get_string_descr
 	if (tbuf[1] != LIBUSB_DT_STRING)
 		return LIBUSB_ERROR_IO;
 
 	if (tbuf[0] > r)
-		return LIBUSB_ERROR_IO;
+            tbuf[0] = r;
 
 	for (di = 0, si = 2; si < tbuf[0]; si += 2) {
 		if (di >= (length - 1))
 			break;