From 48193975e5a0e48ebbb68217f8533ad2bfbdede2 Mon Sep 17 00:00:00 2001
From: Henri Salo <henri.salo@nixu.com>
Date: Tue, 18 Aug 2015 13:42:22 +0300
Subject: [PATCH] Prevent infinite loop in readObject() function. Patch by
 dhudson1. Closes mstamy2/PyPDF2#184

---
 PyPDF2/generic.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/PyPDF2/generic.py b/PyPDF2/generic.py
index df1e028..657612a 100644
--- a/PyPDF2/generic.py
+++ b/PyPDF2/generic.py
@@ -82,6 +82,10 @@ def readObject(stream, pdf):
         # comment
         while tok not in (b_('\r'), b_('\n')):
             tok = stream.read(1)
+            # Prevents an infinite loop by raising an error if the stream is at
+            # the EOF
+            if len(tok) <= 0:
+                raise PdfStreamError("File ended unexpectedly.")
         tok = readNonWhitespace(stream)
         stream.seek(-1, 1)
         return readObject(stream, pdf)