From b4d856a6b52a724e7cf04653f3049a47641a9f39 Mon Sep 17 00:00:00 2001
From: klu2 <klu2@6f19259b-4bc3-4df7-8a09-765794883524>
Date: Mon, 25 Jan 2010 09:56:20 +0000
Subject: [PATCH] Fix the issue that accessing for unaligned address break IPF

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@9809 6f19259b-4bc3-4df7-8a09-765794883524
---
 MdeModulePkg/Core/Pei/FwVol/FwVol.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/MdeModulePkg/Core/Pei/FwVol/FwVol.c b/MdeModulePkg/Core/Pei/FwVol/FwVol.c
index cab1cdb001..d2bd6c493e 100644
--- a/MdeModulePkg/Core/Pei/FwVol/FwVol.c
+++ b/MdeModulePkg/Core/Pei/FwVol/FwVol.c
@@ -853,6 +853,7 @@ ProcessFvFile (
   EFI_PEI_FV_HANDLE             ParentFvHandle;
   EFI_FIRMWARE_VOLUME_HEADER    *FvHeader;
   EFI_FV_FILE_INFO              FileInfo;
+  UINT64                        FvLength;
   
   //
   // Check if this EFI_FV_FILETYPE_FIRMWARE_VOLUME_IMAGE file has already
@@ -890,7 +891,7 @@ ProcessFvFile (
   //
   // FvAlignment must be more than 8 bytes required by FvHeader structure.
   //
-  FvAlignment = 1 << ((FvHeader->Attributes & EFI_FVB2_ALIGNMENT) >> 16);
+  FvAlignment = 1 << ((ReadUnaligned32 (&FvHeader->Attributes) & EFI_FVB2_ALIGNMENT) >> 16);
   if (FvAlignment < 8) {
     FvAlignment = 8;
   }
@@ -899,11 +900,12 @@ ProcessFvFile (
   // Check FvImage
   //
   if ((UINTN) FvHeader % FvAlignment != 0) {
-    NewFvBuffer = AllocateAlignedPages (EFI_SIZE_TO_PAGES ((UINT32) FvHeader->FvLength), FvAlignment);
+    FvLength    = ReadUnaligned64 (&FvHeader->FvLength);
+    NewFvBuffer = AllocateAlignedPages (EFI_SIZE_TO_PAGES ((UINT32) FvLength), FvAlignment);
     if (NewFvBuffer == NULL) {
       return EFI_OUT_OF_RESOURCES;
     }
-    CopyMem (NewFvBuffer, FvHeader, (UINTN) FvHeader->FvLength);
+    CopyMem (NewFvBuffer, FvHeader, (UINTN) FvLength);
     FvHeader = (EFI_FIRMWARE_VOLUME_HEADER*) NewFvBuffer;
   }
   
-- 
2.39.2