Backported of:

From 7798ae25574425271305fffe85de77bec8df03f1 Mon Sep 17 00:00:00 2001
From: Kevin Backhouse <[email protected]>
Date: Wed, 15 May 2019 10:12:02 +0100
Subject: [PATCH] Throw an exception if the data location is invalid. (#842)
diff --git a/src/crwimage.cpp b/src/crwimage.cpp
index 9225ce5..5ccf3b1 100644
--- a/src/crwimage.cpp
+++ b/src/crwimage.cpp
@@ -738,12 +738,11 @@ namespace Exiv2 {
 
     DataLocId CiffComponent::dataLocation(uint16_t tag)
     {
-        DataLocId di = invalidDataLocId;
         switch (tag & 0xc000) {
-        case 0x0000: di = valueData; break;
-        case 0x4000: di = directoryData; break;
+        case 0x0000: return valueData;
+        case 0x4000: return directoryData;
+        default: throw Error(kerCorruptedMetadata);
         }
-        return di;
     } // CiffComponent::dataLocation
 
     /*!
diff --git a/src/crwimage_int.hpp b/src/crwimage_int.hpp
index 5588ae5..1478c82 100644
--- a/src/crwimage_int.hpp
+++ b/src/crwimage_int.hpp
@@ -78,7 +78,6 @@ namespace Exiv2 {
 
     //! Type to identify where the data is stored in a directory
     enum DataLocId {
-        invalidDataLocId,
         valueData,
         directoryData,
         lastDataLocId