diff --git a/MdeModulePkg/Universal/Disk/UdfDxe/FileSystemOperations.c b/MdeModulePkg/Universal/Disk/UdfDxe/FileSystemOperations.c
index 904262a2ba..842c7f8f09 100644
--- a/MdeModulePkg/Universal/Disk/UdfDxe/FileSystemOperations.c
+++ b/MdeModulePkg/Universal/Disk/UdfDxe/FileSystemOperations.c
@@ -962,6 +962,9 @@ ReadFile (
         );
 
       ReadFileInfo->FilePosition += ReadFileInfo->FileDataSize;
+    } else {
+      ASSERT (FALSE);
+      return EFI_INVALID_PARAMETER;
     }
 
     break;