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Victor Stinner
d61fcf834d
If _BlocksOutputBuffer_Finish() fails (memory allocation failure), PyBytesWriter_Discard() is called on the writer. Then if _BlocksOutputBuffer_OnError() is called, it calls again PyBytesWriter_Discard() causing a double free. Fix _BlocksOutputBuffer_Finish() by setting buffer->writer to NULL, so _BlocksOutputBuffer_OnError() does nothing instead of calling PyBytesWriter_Discard() again.
The Python C API ================ The C API is divided into these sections: 1. ``Include/``: Limited API 2. ``Include/cpython/``: CPython implementation details 3. ``Include/cpython/``, names with the ``PyUnstable_`` prefix: API that can change between minor releases 4. ``Include/internal/``, and any name with ``_`` prefix: The internal API Information on changing the C API is available `in the developer guide`_ .. _in the developer guide: https://devguide.python.org/c-api/