[issue46922] tarfile.TarFile.next() crashes on empty tar files

[Ethan Furman]

Change by Ethan Furman :


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nosy: +ethan.furman

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[issue46922] tarfile.TarFile.next() crashes on empty tar files

[progval]

New submission from progval :

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

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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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