From 3e74916c5a658d310c37b7dd73b0305c0d1e8ff9 Mon Sep 17 00:00:00 2001
From: Jay Berkenbilt <ejb@ql.org>
Date: Thu, 3 Jan 2019 09:16:53 -0500
Subject: Fix seg fault on empty xref stream (fixes #263)

Thanks to @p-cher for supplying a patch.
---
 libqpdf/QPDF.cc | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

(limited to 'libqpdf')

diff --git a/libqpdf/QPDF.cc b/libqpdf/QPDF.cc
index 90caafe2..75ee1f13 100644
--- a/libqpdf/QPDF.cc
+++ b/libqpdf/QPDF.cc
@@ -1228,7 +1228,11 @@ QPDF::getObjectCount()
     {
 	o1 = (*(this->m->obj_cache.rbegin())).first;
     }
-    QPDFObjGen o2 = (*(this->m->xref_table.rbegin())).first;
+    QPDFObjGen o2(0, 0);
+    if (! this->m->xref_table.empty())
+    {
+	o2 = (*(this->m->xref_table.rbegin())).first;
+    }
     QTC::TC("qpdf", "QPDF indirect last obj from xref",
 	    (o2.getObj() > o1.getObj()) ? 1 : 0);
     return std::max(o1.getObj(), o2.getObj());
-- 
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