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-rw-r--r--Lib/zipfile.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/Lib/zipfile.py b/Lib/zipfile.py
index 7b6bd5f809..ee228b1475 100644
--- a/Lib/zipfile.py
+++ b/Lib/zipfile.py
@@ -411,7 +411,7 @@ class ZipInfo (object):
# Try to decode the extra field.
extra = self.extra
unpack = struct.unpack
- while extra:
+ while len(extra) >= 4:
tp, ln = unpack('<HH', extra[:4])
if tp == 1:
if ln >= 24: