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structseq.c: NULL dereference in get_type_attr_as_size #148119

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structseq.c: NULL dereference in get_type_attr_as_size#148119
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interpreter-core(Objects, Python, Grammar, and Parser dirs)type-bugAn unexpected behavior, bug, or error

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@Wulian233
Wulian233
opened on Apr 5, 2026

Bug report

Bug description:

Parent: #146102

When PyDict_GetItemWithError returns NULL due to error (not missing key), code falls through to PyLong_AsSsize_t(NULL) at line 37 → segfault. Affects PyStructSequence_New, structseq_new_impl, etc.

CPython versions tested on:

CPython main branch

Operating systems tested on:

No response

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  1. Wulian233
    added
    type-bugAn unexpected behavior, bug, or error
    on Apr 5, 2026
  2. Wulian233
    added a commit that references this issue on Apr 5, 2026

    pythongh-148119: Refactor `get_type_attr_as_size` to improve error ha…

    c08c7b1
  3. aisk
    added a parent issue on Apr 5, 2026
  4. aisk
    added
    interpreter-core(Objects, Python, Grammar, and Parser dirs)
    on Apr 5, 2026
  5. kumaraditya303
    added a commit that references this issue on Apr 6, 2026

    gh-148119: Refactor `get_type_attr_as_size` to improve error handling…

    69f5162
  6. kumaraditya303
    closed this as completedon Apr 6, 2026
  7. ljfp
    added a commit that references this issue on Apr 25, 2026

    pythongh-148119: Refactor `get_type_attr_as_size` to improve error ha…

    e579626
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    interpreter-core(Objects, Python, Grammar, and Parser dirs)type-bugAn unexpected behavior, bug, or error

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