# HG changeset patch
# User Ivo Smits <Ivo@UCIS.nl>
# Date 1366561963 -7200
# Node ID c4a5dbe6251342afdeefd10406bd84665c355b3d
# Parent  6fcedb1030bfb9889875ff89aad0833030ea7389
USBLib: small fix in WinUSB backend bounds checking

diff -r 6fcedb1030bf -r c4a5dbe62513 USBLib/Communication/WinUsb/WinUsbDevice.cs
--- a/USBLib/Communication/WinUsb/WinUsbDevice.cs	Sun Apr 21 18:32:04 2013 +0200
+++ b/USBLib/Communication/WinUsb/WinUsbDevice.cs	Sun Apr 21 18:32:43 2013 +0200
@@ -172,7 +172,7 @@
 		}
 
 		public unsafe override int GetDescriptor(byte descriptorType, byte index, short langId, byte[] buffer, int offset, int length) {
-			if (length > short.MaxValue || offset + length > buffer.Length) throw new ArgumentOutOfRangeException("length");
+			if (length > short.MaxValue || offset < 0 || length < 0 || offset + length > buffer.Length) throw new ArgumentOutOfRangeException("length");
 			fixed (Byte* b = buffer) {
 				if (!WinUsb_GetDescriptor(InterfaceHandles[0], descriptorType, index, (ushort)langId, (IntPtr)(b + offset), length, out length))
 					throw new Win32Exception(Marshal.GetLastWin32Error(), "Descriptor transfer failed");