Issue #8650: Make zlib.[de]compressobj().[de]compress() 64-bit clean.
Raise an OverflowError if the input data is too large, instead of silently
truncating the input and returning an incorrect result.
diff --git a/Lib/test/test_zlib.py b/Lib/test/test_zlib.py
index 6bc386ed..0909aa1 100644
--- a/Lib/test/test_zlib.py
+++ b/Lib/test/test_zlib.py
@@ -523,6 +523,17 @@
decompress = lambda s: d.decompress(s) + d.flush()
self.check_big_decompress_buffer(size, 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)
+ self.assertRaises(OverflowError, zlib.decompress, data)
+ finally:
+ data = None
+
def genblock(seed, length, step=1024, generator=random):
"""length-byte stream of random data from a seed (in step-byte blocks)."""