[PATCH] MdeModulePkg/HiiDatabase: Do not modify CONST string

["Jeff Brasen" <jbrasen@nvidia.com>]

Update function behavior to not modify the incoming string that is
marked as CONST in the prototype.

Signed-off-by: Jeff Brasen <jbrasen@nvidia.com>
---
 .../Universal/HiiDatabaseDxe/ConfigRouting.c        | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/MdeModulePkg/Universal/HiiDatabaseDxe/ConfigRouting.c b/MdeModulePkg/Universal/HiiDatabaseDxe/ConfigRouting.c
index 2cad6d29f4..e08a62c387 100644
--- a/MdeModulePkg/Universal/HiiDatabaseDxe/ConfigRouting.c
+++ b/MdeModulePkg/Universal/HiiDatabaseDxe/ConfigRouting.c
@@ -5497,7 +5497,6 @@ HiiBlockToConfig (
   UINTN                               Index;
   UINT8                               *TemBuffer;
   CHAR16                              *TemString;
-  CHAR16                              TemChar;
 
   TmpBuffer = NULL;
 
@@ -5564,10 +5563,14 @@ HiiBlockToConfig (
   //
   // Copy <ConfigHdr> and an additional '&' to <ConfigResp>
   //
-  TemChar = *StringPtr;
-  *StringPtr = '\0';
-  AppendToMultiString(Config, ConfigRequest);
-  *StringPtr = TemChar;
+
+  TemString = AllocateCopyPool (sizeof (CHAR16) * (StringPtr - ConfigRequest + 1), ConfigRequest);
+  if (TemString == NULL) {
+    return EFI_OUT_OF_RESOURCES;
+  }
+  TemString[StringPtr - ConfigRequest] = '\0';
+  AppendToMultiString(Config, TemString);
+  FreePool (TemString);
 
   //
   // Parse each <RequestElement> if exists
-- 
2.17.1