From fbe12b79aef4c2706e90078cc75b94dcf7926ba8 Mon Sep 17 00:00:00 2001
From: ydong10 <ydong10@6f19259b-4bc3-4df7-8a09-765794883524>
Date: Mon, 18 Oct 2010 11:33:26 +0000
Subject: [PATCH] Refine code to make code run more safely.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@10955 6f19259b-4bc3-4df7-8a09-765794883524
---
 MdeModulePkg/Core/PiSmmCore/Pool.c                          | 4 ++--
 .../Universal/DebugSupportDxe/X64/PlDebugSupportX64.c       | 6 +++---
 MdeModulePkg/Universal/EbcDxe/EbcExecute.c                  | 2 +-
 MdeModulePkg/Universal/EbcDxe/EbcInt.c                      | 2 +-
 MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Input.c            | 2 ++
 .../StatusCodeHandler/RuntimeDxe/SerialStatusCodeWorker.c   | 1 +
 .../StatusCodeHandler/Smm/SerialStatusCodeWorker.c          | 1 +
 7 files changed, 11 insertions(+), 7 deletions(-)

diff --git a/MdeModulePkg/Core/PiSmmCore/Pool.c b/MdeModulePkg/Core/PiSmmCore/Pool.c
index 928b6ed2cc..ea28484d68 100644
--- a/MdeModulePkg/Core/PiSmmCore/Pool.c
+++ b/MdeModulePkg/Core/PiSmmCore/Pool.c
@@ -185,7 +185,7 @@ InternalFreePoolByIndex (
   ASSERT (((UINTN)FreePoolHdr & (FreePoolHdr->Header.Size - 1)) == 0);
   ASSERT (FreePoolHdr->Header.Size >= MIN_POOL_SIZE);
 
-  PoolIndex = HighBitSet32 ((UINT32)FreePoolHdr->Header.Size) - MIN_POOL_SHIFT;
+  PoolIndex = (UINTN) (HighBitSet32 ((UINT32)FreePoolHdr->Header.Size) - MIN_POOL_SHIFT);
   FreePoolHdr->Header.Available = TRUE;
   ASSERT (PoolIndex < MAX_POOL_INDEX);
   InsertHeadList (&mSmmPoolLists[PoolIndex], &FreePoolHdr->Link);
@@ -240,7 +240,7 @@ SmmAllocatePool (
   }
 
   Size = (Size + MIN_POOL_SIZE - 1) >> MIN_POOL_SHIFT;
-  PoolIndex = HighBitSet32 ((UINT32)Size);
+  PoolIndex = (UINTN) HighBitSet32 ((UINT32)Size);
   if ((Size & (Size - 1)) != 0) {
     PoolIndex++;
   }
diff --git a/MdeModulePkg/Universal/DebugSupportDxe/X64/PlDebugSupportX64.c b/MdeModulePkg/Universal/DebugSupportDxe/X64/PlDebugSupportX64.c
index 8e623b9419..fa8869d287 100644
--- a/MdeModulePkg/Universal/DebugSupportDxe/X64/PlDebugSupportX64.c
+++ b/MdeModulePkg/Universal/DebugSupportDxe/X64/PlDebugSupportX64.c
@@ -36,9 +36,9 @@ GetInterruptHandleFromIdt (
   // InterruptHandle 16-31 : OffsetHigh
   // InterruptHandle 32-63 : OffsetUpper
   //
-  ((UINT16 *) &InterruptHandle)[0] = (UINT16) IdtGateDecriptor->Bits.OffsetLow;
-  ((UINT16 *) &InterruptHandle)[1] = (UINT16) IdtGateDecriptor->Bits.OffsetHigh;
-  ((UINT32 *) &InterruptHandle)[1] = (UINT32) IdtGateDecriptor->Bits.OffsetUpper;
+  InterruptHandle = ((UINTN) IdtGateDecriptor->Bits.OffsetLow) |
+                    (((UINTN) IdtGateDecriptor->Bits.OffsetHigh)  << 16) |
+                    (((UINTN) IdtGateDecriptor->Bits.OffsetUpper) << 32) ;
 
   return InterruptHandle;
 }
diff --git a/MdeModulePkg/Universal/EbcDxe/EbcExecute.c b/MdeModulePkg/Universal/EbcDxe/EbcExecute.c
index 48f7dcebdb..0d987043c1 100644
--- a/MdeModulePkg/Universal/EbcDxe/EbcExecute.c
+++ b/MdeModulePkg/Universal/EbcDxe/EbcExecute.c
@@ -2367,7 +2367,7 @@ ExecuteMOVIn (
     // Get the address
     //
     Op1 = (UINT64) VmPtr->Gpr[OPERAND1_REGNUM (Operands)] + Index16;
-    VmWriteMemN (VmPtr, (UINTN) Op1, (INTN) ImmedIndex64);
+    VmWriteMemN (VmPtr, (UINTN) Op1, (UINTN)(INTN) ImmedIndex64);
   }
   //
   // Advance the instruction pointer
diff --git a/MdeModulePkg/Universal/EbcDxe/EbcInt.c b/MdeModulePkg/Universal/EbcDxe/EbcInt.c
index dddfd58566..e94ed8e6c3 100644
--- a/MdeModulePkg/Universal/EbcDxe/EbcInt.c
+++ b/MdeModulePkg/Universal/EbcDxe/EbcInt.c
@@ -747,7 +747,7 @@ EbcDebugSignalException (
   // Save the exception in the context passed in
   //
   VmPtr->ExceptionFlags |= ExceptionFlags;
-  VmPtr->LastException = ExceptionType;
+  VmPtr->LastException = (UINTN) ExceptionType;
   //
   // If it's a fatal exception, then flag it in the VM context in case an
   // attached debugger tries to return from it.
diff --git a/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Input.c b/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Input.c
index be87ec5d98..2bb8cd943e 100644
--- a/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Input.c
+++ b/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Input.c
@@ -883,6 +883,8 @@ Ip4AccpetFrame (
       goto RESTART;
     }
   }
+  
+  ASSERT (Packet != NULL);
   Head  = Packet->Ip.Ip4;
   IP4_GET_CLIP_INFO (Packet)->Status = EFI_SUCCESS;
 
diff --git a/MdeModulePkg/Universal/StatusCodeHandler/RuntimeDxe/SerialStatusCodeWorker.c b/MdeModulePkg/Universal/StatusCodeHandler/RuntimeDxe/SerialStatusCodeWorker.c
index 6267725751..4a5d65d25e 100644
--- a/MdeModulePkg/Universal/StatusCodeHandler/RuntimeDxe/SerialStatusCodeWorker.c
+++ b/MdeModulePkg/Universal/StatusCodeHandler/RuntimeDxe/SerialStatusCodeWorker.c
@@ -90,6 +90,7 @@ SerialStatusCodeReportWorker (
                   Value, 
                   Instance
                   );
+    ASSERT (CharCount > 0);
    
     if (CallerId != NULL) {
       CharCount += AsciiSPrint (
diff --git a/MdeModulePkg/Universal/StatusCodeHandler/Smm/SerialStatusCodeWorker.c b/MdeModulePkg/Universal/StatusCodeHandler/Smm/SerialStatusCodeWorker.c
index 27a243be06..868ffad7a3 100644
--- a/MdeModulePkg/Universal/StatusCodeHandler/Smm/SerialStatusCodeWorker.c
+++ b/MdeModulePkg/Universal/StatusCodeHandler/Smm/SerialStatusCodeWorker.c
@@ -90,6 +90,7 @@ SerialStatusCodeReportWorker (
                   Value, 
                   Instance
                   );
+    ASSERT (CharCount > 0);
    
     if (CallerId != NULL) {
       CharCount += AsciiSPrint (