Backport of

From 9b7a19f957af53304655ed1efe32253a1b11a8d0 Mon Sep 17 00:00:00 2001
From: Kevin Backhouse <kevinbackhouse@github.com>
Date: Fri, 9 Apr 2021 13:37:48 +0100
Subject: [PATCH] Fix integer overflow.

--- exiv2-0.25.orig/src/crwimage.cpp
+++ exiv2-0.25/src/crwimage.cpp
@@ -1312,7 +1312,11 @@ namespace Exiv2 {
                                                  pCrwMapping->crwDir_);
         if (edX != edEnd || edY != edEnd || edO != edEnd) {
             uint32_t size = 28;
-            if (cc && cc->size() > size) size = cc->size();
+            if (cc) {
+              if (cc->size() < size)
+                throw Error(kerCorruptedMetadata);
+              size = cc->size();
+            }
             DataBuf buf(size);
             std::memset(buf.pData_, 0x0, buf.size_);
             if (cc) std::memcpy(buf.pData_ + 8, cc->pData() + 8, cc->size() - 8);