From c22f52c5e79b9782648576efb8382bb04da60b5b Mon Sep 17 00:00:00 2001
From: Max Knutsen <maknutse@microsoft.com>
Date: Tue, 4 Sep 2018 17:04:35 +0000
Subject: MdeModulePkg/ReportStatusCodeLib: Avoid using AllocatePool if
 possible

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1114

V2: simplify the code logic.
update
if (!mHaveExitedBootServices &&
  (StatusCodeData != (EFI_STATUS_CODE_DATA *) StatusCodeBuffer)) {
  gBS->FreePool (StatusCodeData);
}
to
if (StatusCodeData != (EFI_STATUS_CODE_DATA *) StatusCodeBuffer) {
  gBS->FreePool (StatusCodeData);
}

V3:
And the code below into the else condition (stack buffer is not enough)
in /DxeReportStatusCodeLib/ReportStatusCodeLib.c

  if (gBS == NULL || gBS->AllocatePool == NULL || gBS->FreePool == NULL) {
    return EFI_UNSUPPORTED;
  }

V4:
Refine code logic.

When report status code with ExtendedData data,
and the extended data can fit in the local static buffer,
there is no need to use AllocatePool to hold the ExtendedData data.

This patch is just to do the enhancement to avoid using AllocatePool.

Cc: Star Zeng <star.zeng@intel.com>
Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Hao Wu <hao.a.wu@intel.com>
Cc: Michael Turner <Michael.Turner@microsoft.com>
Cc: Liming Gao <liming.gao@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Dandan Bi <dandan.bi@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>
Reviewed-by: Star Zeng <star.zeng@intel.com>
---
 .../RuntimeDxeReportStatusCodeLib/ReportStatusCodeLib.c    | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

(limited to 'MdeModulePkg/Library/RuntimeDxeReportStatusCodeLib/ReportStatusCodeLib.c')

diff --git a/MdeModulePkg/Library/RuntimeDxeReportStatusCodeLib/ReportStatusCodeLib.c b/MdeModulePkg/Library/RuntimeDxeReportStatusCodeLib/ReportStatusCodeLib.c
index b73103517a..9b79854538 100644
--- a/MdeModulePkg/Library/RuntimeDxeReportStatusCodeLib/ReportStatusCodeLib.c
+++ b/MdeModulePkg/Library/RuntimeDxeReportStatusCodeLib/ReportStatusCodeLib.c
@@ -632,12 +632,16 @@ ReportStatusCodeEx (
   ASSERT (!((ExtendedData == NULL) && (ExtendedDataSize != 0)));
   ASSERT (!((ExtendedData != NULL) && (ExtendedDataSize == 0)));
 
-  if (mHaveExitedBootServices) {
-    if (sizeof (EFI_STATUS_CODE_DATA) + ExtendedDataSize > MAX_EXTENDED_DATA_SIZE) {
+  if (ExtendedDataSize <= (MAX_EXTENDED_DATA_SIZE - sizeof (EFI_STATUS_CODE_DATA))) {
+    //
+    // Use Buffer instead of allocating if possible.
+    //
+    StatusCodeData = (EFI_STATUS_CODE_DATA *) StatusCodeBuffer;
+  } else {
+    if (mHaveExitedBootServices) {
       return EFI_OUT_OF_RESOURCES;
     }
-    StatusCodeData = (EFI_STATUS_CODE_DATA *) StatusCodeBuffer;
-  } else  {
+
     if (gBS == NULL || gBS->AllocatePool == NULL || gBS->FreePool == NULL) {
       return EFI_UNSUPPORTED;
     }
@@ -680,7 +684,7 @@ ReportStatusCodeEx (
   //
   // Free the allocated buffer
   //
-  if (!mHaveExitedBootServices) {
+  if (StatusCodeData != (EFI_STATUS_CODE_DATA *) StatusCodeBuffer) {
     gBS->FreePool (StatusCodeData);
   }
 
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