[3.8] bpo-39017: Avoid infinite loop in the tarfile module (GH-21454) by miss-islington · Pull Request #21483 · python/cpython · GitHub
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[3.8] bpo-39017: Avoid infinite loop in the tarfile module (GH-21454) #21483

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Merged
miss-islington merged 1 commit into from
Jul 15, 2020
Merged

[3.8] bpo-39017: Avoid infinite loop in the tarfile module (GH-21454) #21483

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2 changes: 2 additions & 0 deletions Lib/tarfile.py
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Binary file added Lib/test/recursion.tar
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7 changes: 7 additions & 0 deletions Lib/test/test_tarfile.py
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Original file line number Diff line number Diff line change
Expand Up @@ -397,6 +397,13 @@ def test_premature_end_of_archive(self):
with self.assertRaisesRegex(tarfile.ReadError, "unexpected end of data"):
tar.extractfile(t).read()

def test_length_zero_header(self):
# bpo-39017 (CVE-2019-20907): reading a zero-length header should fail
# with an exception
with self.assertRaisesRegex(tarfile.ReadError, "file could not be opened successfully"):
with tarfile.open(support.findfile('recursion.tar')) as tar:
pass

class MiscReadTestBase(CommonReadTest):
def requires_name_attribute(self):
pass
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1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Library/2020-07-12-22-16-58.bpo-39017.x3Cg-9.rst
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