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fix: report incomplete zlib distance trees #2148

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fix: report incomplete zlib distance trees #2148

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2 changes: 1 addition & 1 deletion src/core/IronPython.Modules/zlib/zlib.net/InfTree.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -354,7 +354,7 @@ internal static int inflate_trees_dynamic(int nl, int nd, int[] c, int[] bl, int
{
z.msg = "oversubscribed distance tree";
}
else if (r == (int)ZLibResultCode.Z_DATA_ERROR)
else if (r == (int)ZLibResultCode.Z_BUF_ERROR)
{
z.msg = "incomplete distance tree";
r = (int)ZLibResultCode.Z_DATA_ERROR;
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14 changes: 13 additions & 1 deletion tests/suite/modules/misc/test_zlib.py
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Original file line number Diff line number Diff line change
Expand Up @@ -9,7 +9,7 @@
import unittest
import zlib

from iptest import IronPythonTestCase, run_test
from iptest import IronPythonTestCase, is_cli, run_test

def create_gzip(text, path):
import gzip
Expand Down Expand Up @@ -76,6 +76,18 @@ def test_deflate(self):
self.assertEqual(do.decompress(self.deflate_data), self.text)
self.assertEqual(zlib.decompress(self.deflate_data, -zlib.MAX_WBITS), self.text)

def test_incomplete_distance_tree(self):
# The literal tree is complete, but the distance alphabet has only one code of length two.
data = bytes.fromhex('05c0010900000080a06dfe3f65')
message = 'incomplete distance tree' if is_cli else 'invalid distances set'
for streaming in (False, True):
with self.subTest(streaming=streaming):
with self.assertRaisesRegex(zlib.error, message):
if streaming:
zlib.decompressobj(-zlib.MAX_WBITS).decompress(data)
else:
zlib.decompress(data, -zlib.MAX_WBITS)

def test_gzip_stream(self):
"""gzip header, uncomplete header"""
for delta in range(1, 25):
Expand Down
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