[edk2-devel] [PATCH v2 2/6] MdeModulePkg: PiSmmIpl: Update MessageLength calculation for MmCommunicate

[Kun Qin]

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3398

This change updated calculation routine for MM communication in PiSmmIpl.
It removes ambiguity brought in by UINTN variables from this routine and
paves way for updating definition of field MessageLength in
EFI_MM_COMMUNICATE_HEADER to definitive size.

Cc: Jian J Wang <jian.j.wang at intel.com>
Cc: Hao A Wu <hao.a.wu at intel.com>
Cc: Eric Dong <eric.dong at intel.com>
Cc: Ray Ni <ray.ni at intel.com>

Signed-off-by: Kun Qin <kuqin12 at gmail.com>
Reviewed-by: Hao A Wu <hao.a.wu at intel.com>
---

Notes:
    v2:
    - Removed "BZ" tags from comments and variables [Hao]
    - Added "Reviewed-by" tag [Hao]

 MdeModulePkg/Core/PiSmmCore/PiSmmIpl.c   | 11 ++++++++++-
 MdeModulePkg/Core/PiSmmCore/PiSmmIpl.inf |  1 +
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/MdeModulePkg/Core/PiSmmCore/PiSmmIpl.c b/MdeModulePkg/Core/PiSmmCore/PiSmmIpl.c
index 599a0cd01d80..01cde6cfc3e4 100644
--- a/MdeModulePkg/Core/PiSmmCore/PiSmmIpl.c
+++ b/MdeModulePkg/Core/PiSmmCore/PiSmmIpl.c
@@ -34,6 +34,7 @@
 #include <Library/UefiRuntimeLib.h>
 #include <Library/PcdLib.h>
 #include <Library/ReportStatusCodeLib.h>
+#include <Library/SafeIntLib.h>
 
 #include "PiSmmCorePrivateData.h"
 
@@ -515,6 +516,7 @@ SmmCommunicationCommunicate (
   EFI_STATUS                  Status;
   EFI_SMM_COMMUNICATE_HEADER  *CommunicateHeader;
   BOOLEAN                     OldInSmm;
+  UINT64                      LongCommSize;
   UINTN                       TempCommSize;
 
   //
@@ -527,7 +529,14 @@ SmmCommunicationCommunicate (
   CommunicateHeader = (EFI_SMM_COMMUNICATE_HEADER *) CommBuffer;
 
   if (CommSize == NULL) {
-    TempCommSize = OFFSET_OF (EFI_SMM_COMMUNICATE_HEADER, Data) + CommunicateHeader->MessageLength;
+    Status = SafeUint64Add (OFFSET_OF (EFI_SMM_COMMUNICATE_HEADER, Data), CommunicateHeader->MessageLength, &LongCommSize);
+    if (EFI_ERROR (Status)) {
+      return EFI_INVALID_PARAMETER;
+    }
+    Status = SafeUint64ToUintn (LongCommSize, &TempCommSize);
+    if (EFI_ERROR (Status)) {
+      return EFI_INVALID_PARAMETER;
+    }
   } else {
     TempCommSize = *CommSize;
     //
diff --git a/MdeModulePkg/Core/PiSmmCore/PiSmmIpl.inf b/MdeModulePkg/Core/PiSmmCore/PiSmmIpl.inf
index 6109d6b5449c..ddeb39cee266 100644
--- a/MdeModulePkg/Core/PiSmmCore/PiSmmIpl.inf
+++ b/MdeModulePkg/Core/PiSmmCore/PiSmmIpl.inf
@@ -46,6 +46,7 @@ [LibraryClasses]
   DxeServicesLib
   PcdLib
   ReportStatusCodeLib
+  SafeIntLib
 
 [Protocols]
   gEfiSmmBase2ProtocolGuid                      ## PRODUCES
-- 
2.31.1.windows.1



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