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Posted to jira@arrow.apache.org by "Tobias Zagorni (Jira)" <ji...@apache.org> on 2022/03/23 18:51:00 UTC

[jira] [Created] (ARROW-16013) [C++][Python] Wrong stride/address calculation when using negative stride in NumPyStridedConverter

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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