Tobias Zagorni created ARROW-16013:
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Summary: [C++][Python] Wrong stride/address calculation when using
negative stride in NumPyStridedConverter
Key: ARROW-16013
URL: https://issues.apache.org/jira/browse/ARROW-16013
Project: Apache Arrow
Issue Type: Bug
Components: C++, Python
Reporter: Tobias Zagorni
Assignee: Tobias Zagorni
The calculation of the stride value passed to `CopyStridedNatural` by
`NumPyStridedConverter::Visit` divides the stride value by sizeof(T), which is
unsigned, without an appropriate type case. This causes CopyStridedNatural to
access bogus indices.
This is triggered by the existing test method `test_numpy_to_pyarrow` in
`test_array.py`. For some reason this neither causes a direct crash, nor is the
output to python affected. Only ubsan catches an integer overflow
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