Fix crash when Object has negative number

Spec says object number has to be > 0 and gen has to be >= 0

Reported by email

1 files changed, 5 insertions, 0 deletions

diff --git a/poppler/Parser.cc b/poppler/Parser.cc
index 39c9a967..8b0093e3 100644
--- a/poppler/Parser.cc
+++ b/poppler/Parser.cc
@@ -154,6 +154,11 @@ Object Parser::getObj(GBool simpleOnly,
       const int gen = buf1.getInt();
       shift();
       shift();
+
+      if (unlikely(num <= 0 || gen < 0)) {
+          return Object();
+      }
+
       return Object(num, gen);
     } else {
       return Object(num);