From 68966932510213b5656fcf433ab6d7e26f48e23b Mon Sep 17 00:00:00 2001
From: Luis Diaz Mas <piponazo@gmail.com>
Date: Sun, 4 Nov 2018 22:33:03 +0100
Subject: [PATCH] PSD: Use Safe::add for preventing overflows in PSD files

---
 src/psdimage.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/psdimage.cpp b/src/psdimage.cpp
index 02e0e87b0..a5a8d9fe9 100644
--- a/src/psdimage.cpp
+++ b/src/psdimage.cpp
@@ -33,6 +33,7 @@
 #include "basicio.hpp"
 #include "error.hpp"
 #include "futils.hpp"
+#include "safe_op.hpp"
 
 // + standard includes
 #include <string>
@@ -228,7 +229,8 @@ namespace Exiv2 {
             readResourceBlock(resourceId, resourceSize);
             resourceSize = (resourceSize + 1) & ~1;        // pad to even
             io_->seek(curOffset + resourceSize, BasicIo::beg);
-            resourcesLength -= (12 + resourceNameLength + resourceSize);
+            resourcesLength -= Safe::add(Safe::add(static_cast<uint32_t>(12), resourceNameLength),
+                                         resourceSize);
         }
 
     } // PsdImage::readMetadata