From 383c303c497d5268f62790de46c5c82d20c65bd6 Mon Sep 17 00:00:00 2001
From: qhuang8 <qhuang8@6f19259b-4bc3-4df7-8a09-765794883524>
Date: Tue, 4 Mar 2008 11:33:13 +0000
Subject: Fix two minor defects: 1. CoreGetMemoryMap() returns unclean data 2.
 Zero length memory descriptor might be added to the memory map

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@4790 6f19259b-4bc3-4df7-8a09-765794883524
---
 MdeModulePkg/Core/Dxe/Gcd/gcd.c | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'MdeModulePkg/Core/Dxe/Gcd')

diff --git a/MdeModulePkg/Core/Dxe/Gcd/gcd.c b/MdeModulePkg/Core/Dxe/Gcd/gcd.c
index 1d023548d3..3cadab29dc 100644
--- a/MdeModulePkg/Core/Dxe/Gcd/gcd.c
+++ b/MdeModulePkg/Core/Dxe/Gcd/gcd.c
@@ -2473,6 +2473,9 @@ Returns:
       if (MemorySpaceMap[Index].ImageHandle == NULL) {
         BaseAddress  = PageAlignAddress (MemorySpaceMap[Index].BaseAddress);
         Length       = PageAlignLength  (MemorySpaceMap[Index].BaseAddress + MemorySpaceMap[Index].Length - BaseAddress);
+        if (Length == 0 || MemorySpaceMap[Index].BaseAddress + MemorySpaceMap[Index].Length < BaseAddress) {
+          continue;
+        }
         CoreAddMemoryDescriptor (
           EfiConventionalMemory,
           BaseAddress,
-- 
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