1 files changed, 46 insertions, 0 deletions
diff --git a/backport-CVE-2022-37051.patch b/backport-CVE-2022-37051.patch
new file mode 100644
index 0000000..9c05c3e
--- /dev/null
+++ b/backport-CVE-2022-37051.patch
@@ -0,0 +1,46 @@
+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