[Patch] NetworkPkg/TlsAuthConfigDxe: Close and free the file related resource

[Jiaxin Wu <jiaxin.wu@intel.com>]

TlsAuthConfigDxe open file by FileExplorerLib. It need to close
file handler and free file related resource in some cases.
* User enrolls Cert by escape the Config page.
* The Cert is not X509 type.
* User chooses another file after he selected a file.

Cc: Zhang Chao B <chao.b.zhang@intel.com>
Cc: Ye Ting <ting.ye@intel.com>
Cc: Fu Siyuan <siyuan.fu@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Wu Jiaxin <jiaxin.wu@intel.com>
---
 NetworkPkg/TlsAuthConfigDxe/TlsAuthConfigImpl.c | 43 ++++++++++++++++++++++++-
 1 file changed, 42 insertions(+), 1 deletion(-)

diff --git a/NetworkPkg/TlsAuthConfigDxe/TlsAuthConfigImpl.c b/NetworkPkg/TlsAuthConfigDxe/TlsAuthConfigImpl.c
index 81f7e7d..23442fe 100644
--- a/NetworkPkg/TlsAuthConfigDxe/TlsAuthConfigImpl.c
+++ b/NetworkPkg/TlsAuthConfigDxe/TlsAuthConfigImpl.c
@@ -1559,11 +1559,12 @@ TlsAuthConfigAccessCallback (
   }
 
   HiiGetBrowserData (&gTlsAuthConfigGuid, mTlsAuthConfigStorageName, BufferSize, (UINT8 *) IfrNvData);
 
   if ((Action != EFI_BROWSER_ACTION_CHANGED) &&
-      (Action != EFI_BROWSER_ACTION_CHANGING)) {
+      (Action != EFI_BROWSER_ACTION_CHANGING) && 
+      (Action != EFI_BROWSER_ACTION_FORM_CLOSE)) {
     Status = EFI_UNSUPPORTED;
     goto EXIT;
   }
 
   if (Action == EFI_BROWSER_ACTION_CHANGING) {
@@ -1590,26 +1591,54 @@ TlsAuthConfigAccessCallback (
       // Refresh selected file.
       //
       CleanUpPage (LabelId, Private);
       break;
     case KEY_TLS_AUTH_CONFIG_ENROLL_CERT_FROM_FILE:
+      //
+      // If the file is already opened, then close and 
+      // free the related resource first. 
+      //
+      if (Private->FileContext->FHandle != NULL) {
+        CloseFile (Private->FileContext->FHandle);
+        Private->FileContext->FHandle = NULL;
+        if (Private->FileContext->FileName!= NULL){
+          FreePool(Private->FileContext->FileName);
+          Private->FileContext->FileName = NULL;
+        }
+      }
+      
       ChooseFile( NULL, NULL, UpdateCAFromFile, &File);
       break;
 
     case KEY_TLS_AUTH_CONFIG_VALUE_SAVE_AND_EXIT:
       Status = EnrollCertDatabase (Private, EFI_TLS_CA_CERTIFICATE_VARIABLE);
       if (EFI_ERROR (Status)) {
+        //
+        // Close File and free the related resource. 
+        //
+        if (Private->FileContext->FHandle != NULL) {
+          CloseFile (Private->FileContext->FHandle);
+          Private->FileContext->FHandle = NULL;
+          if (Private->FileContext->FileName!= NULL){
+            FreePool(Private->FileContext->FileName);
+            Private->FileContext->FileName = NULL;
+          }
+        }
+        
         CreatePopUp (
           EFI_LIGHTGRAY | EFI_BACKGROUND_BLUE,
           &Key,
           L"ERROR: Enroll Cert Failure!",
           NULL
           );
       }
       break;
 
     case KEY_TLS_AUTH_CONFIG_VALUE_NO_SAVE_AND_EXIT:
+      //
+      // Close File and free the related resource. 
+      //
       if (Private->FileContext->FHandle != NULL) {
         CloseFile (Private->FileContext->FHandle);
         Private->FileContext->FHandle = NULL;
         if (Private->FileContext->FileName!= NULL){
           FreePool(Private->FileContext->FileName);
@@ -1665,10 +1694,22 @@ TlsAuthConfigAccessCallback (
       *ActionRequest = EFI_BROWSER_ACTION_REQUEST_FORM_APPLY;
       break;
     default:
       break;
     }
+  } else if (Action == EFI_BROWSER_ACTION_FORM_CLOSE) {
+    //
+    // Close File and free the related resource. 
+    //
+    if (Private->FileContext->FHandle != NULL) {
+      CloseFile (Private->FileContext->FHandle);
+      Private->FileContext->FHandle = NULL;
+      if (Private->FileContext->FileName!= NULL){
+        FreePool(Private->FileContext->FileName);
+        Private->FileContext->FileName = NULL;
+      }
+    }
   }
 
 EXIT:
 
   if (!EFI_ERROR (Status)) {
-- 
1.9.5.msysgit.1