diff --git a/SecurityPkg/Tcg/TcgDxe/TcgDxe.c b/SecurityPkg/Tcg/TcgDxe/TcgDxe.c
index 5b8f45d83f..4b5380ba87 100644
--- a/SecurityPkg/Tcg/TcgDxe/TcgDxe.c
+++ b/SecurityPkg/Tcg/TcgDxe/TcgDxe.c
@@ -262,6 +262,10 @@ TcgDxeHashAll (
       }
       *HashedDataLen = sizeof (TPM_DIGEST);
 
+	  if (*HashedDataResult == NULL) {
+	  	*HashedDataResult = AllocatePool ((UINTN) *HashedDataLen);
+	  } 
+
       return TpmCommHashAll (
                HashData,
                (UINTN) HashDataLen,