Fix closes Issue6090 - Raise a ValueError, instead of failing with unrelated

exceptions, when a document with timestamp earlier than 1980 is provided to
zipfile. Patch contributed by  Petri Lehtinen.

2 files changed, 14 insertions, 0 deletions

diff --git a/Lib/test/test_zipfile.py b/Lib/test/test_zipfile.py
index 6cba26c..7ebb663 100644
--- a/Lib/test/test_zipfile.py
+++ b/Lib/test/test_zipfile.py
@@ -477,6 +477,12 @@ class TestsWithSourceFile(unittest.TestCase):
         except zipfile.BadZipfile:
             self.assertTrue(zipfp2.fp is None, 'zipfp is not closed')
 
+    def test_add_file_before_1980(self):
+        # Set atime and mtime to 1970-01-01
+        os.utime(TESTFN, (0, 0))
+        with zipfile.ZipFile(TESTFN2, "w") as zipfp:
+            self.assertRaises(ValueError, zipfp.write, TESTFN)
+
     def tearDown(self):
         unlink(TESTFN)
         unlink(TESTFN2)
@@ -990,6 +996,10 @@ class OtherTests(unittest.TestCase):
             pass
         self.assertRaises(zipfile.BadZipfile, zipfile.ZipFile, TESTFN, 'r')
 
+    def test_create_zipinfo_before_1980(self):
+        self.assertRaises(ValueError,
+                          zipfile.ZipInfo, 'seventies', (1979, 1, 1, 0, 0, 0))
+
     def tearDown(self):
         unlink(TESTFN)
         unlink(TESTFN2)
diff --git a/Lib/zipfile.py b/Lib/zipfile.py
index f876f42..d9181f2 100644
--- a/Lib/zipfile.py
+++ b/Lib/zipfile.py
@@ -290,6 +290,10 @@ class ZipInfo (object):
 
         self.filename = filename        # Normalized file name
         self.date_time = date_time      # year, month, day, hour, min, sec
+
+        if date_time[0] < 1980:
+            raise ValueError('ZIP does not support timestamps before 1980')
+
         # Standard values:
         self.compress_type = ZIP_STORED # Type of compression for the file
         self.comment = ""               # Comment for each file