Issue #8650: zlib.compress() and zlib.decompress() raise an OverflowError if
the input buffer length doesn't fit into an unsigned int (length bigger than
2^32-1 bytes).
diff --git a/Lib/test/test_zlib.py b/Lib/test/test_zlib.py
index 0f5a1ca..5615c2d 100644
--- a/Lib/test/test_zlib.py
+++ b/Lib/test/test_zlib.py
@@ -2,7 +2,7 @@
from test import support
import binascii
import random
-from test.support import precisionbigmemtest, _1G
+from test.support import precisionbigmemtest, _1G, _4G
zlib = support.import_module('zlib')
@@ -158,6 +158,16 @@
def test_big_decompress_buffer(self, size):
self.check_big_decompress_buffer(size, zlib.decompress)
+ @precisionbigmemtest(size=_4G + 100, memuse=1)
+ def test_length_overflow(self, size):
+ if size < _4G + 100:
+ self.skipTest("not enough free memory, need at least 4 GB")
+ data = b'x' * size
+ try:
+ self.assertRaises(OverflowError, zlib.compress, data, 1)
+ finally:
+ data = None
+
class CompressObjectTestCase(BaseCompressTestCase, unittest.TestCase):
# Test compression object