From: Star Zeng <star.zeng@intel.com>
Date: Thu, 26 May 2016 05:21:08 +0000 (+0800)
Subject: MdeModulePkg SmmLockBoxSmmLib: Add DESTRUCTOR SmmLockBoxSmmDestructor
X-Git-Tag: edk2-stable201903~6886
X-Git-Url: https://git.proxmox.com/?p=mirror_edk2.git;a=commitdiff_plain;h=738df706c1192a546bd88f017dc00d263f2bc1c2

MdeModulePkg SmmLockBoxSmmLib: Add DESTRUCTOR SmmLockBoxSmmDestructor

SmmLockBoxSmmLib is linked to SMM modules. If the module entry-point
function returns error, the module will be unloaded and the global
variables will point to undefined memory.

This patch is to add DESTRUCTOR SmmLockBoxSmmDestructor to uninstall
SmmLockBoxCommunication configuration table if it has been installed
in Constructor.

Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Tested-by: Laszlo Ersek <lersek@redhat.com>
---

diff --git a/MdeModulePkg/Library/SmmLockBoxLib/SmmLockBoxSmmLib.c b/MdeModulePkg/Library/SmmLockBoxLib/SmmLockBoxSmmLib.c
index 38be18560f..4960df7555 100644
--- a/MdeModulePkg/Library/SmmLockBoxLib/SmmLockBoxSmmLib.c
+++ b/MdeModulePkg/Library/SmmLockBoxLib/SmmLockBoxSmmLib.c
@@ -30,6 +30,8 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
 SMM_LOCK_BOX_CONTEXT mSmmLockBoxContext;
 LIST_ENTRY           mLockBoxQueue = INITIALIZE_LIST_HEAD_VARIABLE (mLockBoxQueue);
 
+BOOLEAN              mSmmConfigurationTableInstalled = FALSE;
+
 /**
   This function return SmmLockBox context from SMST.
 
@@ -114,6 +116,7 @@ SmmLockBoxSmmConstructor (
                     sizeof(mSmmLockBoxContext)
                     );
   ASSERT_EFI_ERROR (Status);
+  mSmmConfigurationTableInstalled = TRUE;
 
   DEBUG ((EFI_D_INFO, "SmmLockBoxSmmLib SmmLockBoxContext - %x\n", (UINTN)&mSmmLockBoxContext));
   DEBUG ((EFI_D_INFO, "SmmLockBoxSmmLib LockBoxDataAddress - %x\n", (UINTN)&mLockBoxQueue));
@@ -122,6 +125,42 @@ SmmLockBoxSmmConstructor (
   return Status;
 }
 
+/**
+  Destructor for SmmLockBox library.
+  This is used to uninstall SmmLockBoxCommunication configuration table
+  if it has been installed in Constructor.
+
+  @param[in] ImageHandle    Image handle of this driver.
+  @param[in] SystemTable    A Pointer to the EFI System Table.
+
+  @retval EFI_SUCEESS       The destructor always returns EFI_SUCCESS.
+
+**/
+EFI_STATUS
+EFIAPI
+SmmLockBoxSmmDestructor (
+  IN EFI_HANDLE         ImageHandle,
+  IN EFI_SYSTEM_TABLE   *SystemTable
+  )
+{
+  EFI_STATUS            Status;
+
+  DEBUG ((EFI_D_INFO, "SmmLockBoxSmmLib SmmLockBoxSmmDestructor in %a module\n", gEfiCallerBaseName));
+
+  if (mSmmConfigurationTableInstalled) {
+    Status = gSmst->SmmInstallConfigurationTable (
+                      gSmst,
+                      &gEfiSmmLockBoxCommunicationGuid,
+                      NULL,
+                      0
+                      );
+    ASSERT_EFI_ERROR (Status);
+    DEBUG ((EFI_D_INFO, "SmmLockBoxSmmLib uninstall SmmLockBoxCommunication configuration table\n"));
+  }
+
+  return EFI_SUCCESS;
+}
+
 /**
   This function return SmmLockBox queue address.
 
diff --git a/MdeModulePkg/Library/SmmLockBoxLib/SmmLockBoxSmmLib.inf b/MdeModulePkg/Library/SmmLockBoxLib/SmmLockBoxSmmLib.inf
index d722f57a66..eb7ba0bb2e 100644
--- a/MdeModulePkg/Library/SmmLockBoxLib/SmmLockBoxSmmLib.inf
+++ b/MdeModulePkg/Library/SmmLockBoxLib/SmmLockBoxSmmLib.inf
@@ -23,6 +23,7 @@
   VERSION_STRING                 = 1.0
   LIBRARY_CLASS                  = LockBoxLib|DXE_SMM_DRIVER
   CONSTRUCTOR                    = SmmLockBoxSmmConstructor
+  DESTRUCTOR                     = SmmLockBoxSmmDestructor
 
 #
 # The following information is for reference only and not required by the build tools.