From 134c1f33ed942219fa4bdd5b9525193ebff6360b Mon Sep 17 00:00:00 2001
From: eric_tian <eric_tian@6f19259b-4bc3-4df7-8a09-765794883524>
Date: Wed, 3 Jun 2009 01:57:56 +0000
Subject: [PATCH] modify the implementation of GetInterface and
 GetConfiguration to force the high byte of output type parameters zero.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@8447 6f19259b-4bc3-4df7-8a09-765794883524
---
 MdePkg/Library/UefiUsbLib/UsbDxeLib.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/MdePkg/Library/UefiUsbLib/UsbDxeLib.c b/MdePkg/Library/UefiUsbLib/UsbDxeLib.c
index c27fb03499..521fdd0101 100644
--- a/MdePkg/Library/UefiUsbLib/UsbDxeLib.c
+++ b/MdePkg/Library/UefiUsbLib/UsbDxeLib.c
@@ -177,6 +177,8 @@ UsbGetInterface (
   ASSERT (AlternateSetting != NULL);
   ASSERT (Status != NULL);
 
+  *AlternateSetting = 0;
+
   ZeroMem (&DevReq, sizeof (EFI_USB_DEVICE_REQUEST));
 
   DevReq.RequestType  = USB_DEV_GET_INTERFACE_REQ_TYPE;
@@ -283,6 +285,8 @@ UsbGetConfiguration (
   ASSERT (ConfigurationValue != NULL);
   ASSERT (Status != NULL);
 
+  *ConfigurationValue = 0;
+
   ZeroMem (&DevReq, sizeof (EFI_USB_DEVICE_REQUEST));
 
   DevReq.RequestType  = USB_DEV_GET_CONFIGURATION_REQ_TYPE;