From 0d516cfb50d3ddfecfa3fd2b68e48621a96a1be9 Mon Sep 17 00:00:00 2001
From: Savva Mitrofanov <savvamtr@gmail.com>
Date: Fri, 9 Dec 2022 16:46:50 +0600
Subject: [PATCH] UefiCpuPkg/CpuExceptionHandlerLib: Increase mBuffer size

Add missing GDT alignment into mBuffer to prevent possible memory
corruption on ALIGN_POINTER operation on NewGdtTable
in ArchExceptionHandler

Signed-off-by: Savva Mitrofanov <savvamtr@gmail.com>
---
 UefiCpuPkg/Library/CpuExceptionHandlerLib/DxeException.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/UefiCpuPkg/Library/CpuExceptionHandlerLib/DxeException.c b/UefiCpuPkg/Library/CpuExceptionHandlerLib/DxeException.c
index ee989bf079..d4e9979c92 100644
--- a/UefiCpuPkg/Library/CpuExceptionHandlerLib/DxeException.c
+++ b/UefiCpuPkg/Library/CpuExceptionHandlerLib/DxeException.c
@@ -24,7 +24,7 @@ EXCEPTION_HANDLER_DATA     mExceptionHandlerData = {
 };
 
 UINT8  mBuffer[CPU_STACK_SWITCH_EXCEPTION_NUMBER * CPU_KNOWN_GOOD_STACK_SIZE
-               + CPU_TSS_GDT_SIZE];
+               + sizeof (IA32_TSS_DESCRIPTOR) + CPU_TSS_GDT_SIZE];
 
 /**
   Common exception handler.