From 4631115647c1e4f0482ffe0491c2f38d2231337b Mon Sep 17 00:00:00 2001
From: crt <chluo@cse.cuhk.edu.hk>
Date: Fri, 29 Jul 2022 20:51:11 +0000
Subject: [PATCH] Check isDict before calling getDict

Issue #1276
---
 utils/pdfunite.cc | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/utils/pdfunite.cc b/utils/pdfunite.cc
index a8116e3..9735096 100644
--- a/utils/pdfunite.cc
+++ b/utils/pdfunite.cc
@@ -210,6 +210,14 @@ int main (int argc, char *argv[])
   Object ocObj;
   if (docs.size() >= 1) {
     Object catObj = docs[0]->getXRef()->getCatalog();
+    if(!catObj.isDict()){
+        fclose(f);
+        delete yRef;
+        delete countRef;
+        delete outStr;
+        error(errSyntaxError, -1, "XRef's Catalog is not a dictionary.");
+        return -1;
+    }
     Dict *catDict = catObj.getDict();
     intents = catDict->lookup("OutputIntents");
     afObj = catDict->lookupNF("AcroForm").copy();
@@ -310,6 +318,14 @@ int main (int argc, char *argv[])
       }
     }
     Object pageCatObj = docs[i]->getXRef()->getCatalog();
+    if(!pageCatObj.isDict()){
+        fclose(f);
+        delete yRef;
+        delete countRef;
+        delete outStr;
+        error(errSyntaxError, -1, "XRef's Catalog is not a dictionary.");
+        return -1;
+    }
     Dict *pageCatDict = pageCatObj.getDict();
     Object pageNames = pageCatDict->lookup("Names");
     if (!pageNames.isNull() && pageNames.isDict()) {
-- 
2.33.0