[PATCH] MdeModulePkg:Platform exception when callback function was destroyed by unconnected controller in setup browser

[GregX Yeh <gregx.yeh@intel.com>]

https://bugzilla.tianocore.org/show_bug.cgi?id=1920
Check ConfigAccess available before call callback function.

Signed-off-by: GregX Yeh <gregx.yeh@intel.com>
Cc: Dandan Bi <dandan.bi@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
Cc: Ted Kuo <ted.kuo@intel.com>
---
 MdeModulePkg/Universal/SetupBrowserDxe/Presentation.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/MdeModulePkg/Universal/SetupBrowserDxe/Presentation.c b/MdeModulePkg/Universal/SetupBrowserDxe/Presentation.c
index d7927725b2..a613ab350c 100644
--- a/MdeModulePkg/Universal/SetupBrowserDxe/Presentation.c
+++ b/MdeModulePkg/Universal/SetupBrowserDxe/Presentation.c
@@ -1958,6 +1958,23 @@ ProcessCallBackFunction (
   if (ConfigAccess == NULL) {
     return EFI_SUCCESS;
   }
+//
+// Check ConfigAccess available.
+//
+  Status = gBS->HandleProtocol (
+                  FormSet->DriverHandle,
+                  &gEfiHiiConfigAccessProtocolGuid,
+                  (VOID **) &FormSet->ConfigAccess
+                  );
+  if (EFI_ERROR (Status)) {
+    //
+    // Configuration Driver don't attach ConfigAccess protocol to its HII package
+    // list, then there will be no configuration action required.
+    // Or the ConfigAccess protocol has been uninstalled.
+    //
+    FormSet->ConfigAccess = NULL;
+    return EFI_SUCCESS;
+  }
 
   Link = GetFirstNode (&Form->StatementListHead);
   while (!IsNull (&Form->StatementListHead, Link)) {
-- 
2.16.2.windows.1