--- poppler-0.26.5/poppler/Parser.cc

+++ poppler-0.26.5/poppler/Parser.cc

@@ -19,6 +19,7 @@

 // Copyright (C) 2012 Hib Eris <hib@hiberis.nl>

 // Copyright (C) 2013 Adrian Johnson <ajohnson@redneon.com>

 // Copyright (C) 2013 Thomas Freitag <Thomas.Freitag@alfa.de>

+// Copyright (C) 2018 Albert Astals Cid <aacid@kde.org>

 //

 // To see a description of the changes please see the Changelog file that

 // came with your tarball or type make ChangeLog if you are building from git

@@ -257,6 +258,12 @@ Stream *Parser::makeStream(Object *dict,

       pos = pos - 1;

       lexer->lookCharLastValueCached = Lexer::LOOK_VALUE_NOT_CACHED;

   }

+  if (unlikely(length < 0)) {

+      return NULL;

+  }

+  if (unlikely(pos > LONG_LONG_MAX - length)) {

+      return NULL;

+  }

   lexer->setPos(pos + length);

   // refill token buffers and check for 'endstream'