Index: Lib/zipfile.py
===================================================================
--- Lib/zipfile.py	(revision 68230)
+++ Lib/zipfile.py	(working copy)
@@ -228,6 +228,9 @@
     if start >= 0:
         # found the magic number; attempt to unpack and interpret
         recData = data[start:start+sizeEndCentDir]
+        if len(recData) != sizeEndCentDir:
+            # Zip file is corrupted.
+            return
         endrec = list(struct.unpack(structEndArchive, recData))
         comment = data[start+sizeEndCentDir:]
         # check that comment length is correct