File poppler-CVE-2022-37050.patch of Package poppler.31743

From dcd5bd8238ea448addd102ff045badd0aca1b990 Mon Sep 17 00:00:00 2001
From: crt <chluo@cse.cuhk.edu.hk>
Date: Wed, 27 Jul 2022 08:40:02 +0000
Subject: [PATCH] pdfseparate: Check XRef's Catalog for being a Dict

---
 poppler/PDFDoc.cc | 4 ++++
 1 file changed, 4 insertions(+)

Index: poppler-0.24.4/poppler/PDFDoc.cc
===================================================================
--- poppler-0.24.4.orig/poppler/PDFDoc.cc
+++ poppler-0.24.4/poppler/PDFDoc.cc
@@ -679,6 +679,14 @@ int PDFDoc::savePageAs(GooString *name,
   // get and mark output intents etc.
   Object catObj, pagesObj, resourcesObj;
   getXRef()->getCatalog(&catObj);
+  if (!catObj.isDict()) {
+      fclose(f);
+      delete yRef;
+      delete countRef;
+      delete outStr;        
+      error(errSyntaxError, -1, "XRef's Catelog is not a dictionary");
+      return errOpenFile;
+  }
   Dict *catDict = catObj.getDict();
   catDict->lookup("Pages", &pagesObj);
   Dict *pagesDict = pagesObj.getDict();