New submission from progval <progval+bugs.python....@progval.net>:
Hi,
I found two related bugs when calling tarfile.TarFile.next() on an empty tar
file, both when trying to seek when it should not:
import io
import tarfile
# Create a tarball with no member:
fd = io.BytesIO()
with tarfile.open(fileobj=fd, mode="w") as tf:
pass
# read in stream mode:
fd.seek(0)
with tarfile.open(fileobj=fd, mode="r|") as tf:
print(tf.next()) # tarfile.StreamError: seeking backwards is not allowed
# read in normal mode:
fd.seek(0)
with tarfile.open(fileobj=fd, mode="r") as tf:
print(tf.next()) # ValueError: negative seek value -1
----------
components: Library (Lib)
messages: 414536
nosy: progval
priority: normal
severity: normal
status: open
title: tarfile.TarFile.next() crashes on empty tar files
versions: Python 3.10, Python 3.9
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue46922>
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