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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"PyType_FromSpec may leak memory with repeated slot IDs","articleBody":"If a slot ID is repeated in `PyType_Spec`, the current `PyType_FromSpec` implementation happens to *usually* use the last one and ignore earlier ones, but:\r\n- if `Py_tp_doc` is repeated, `PyType_FromSpec` may leak memory, and\r\n- if `Py_tp_members` is repeated, `PyType_FromSpec` may memcpy unintialized memory (if slot specifies fewer members than the last one).\r\n\r\nWe chould:\r\n- clarify in the docs that repeated slot IDs are not supported\r\n- raise an exception for duplicate slots (at least when it's easy to detect, as in the cases above)\r\n\r\nAlternatively, we could formalize that the last slot of a given ID “wins” and fix the leak/mem issue, but I don't see a use case for this more complex behavior.\r\n","author":{"url":"https://github.com/encukou","@type":"Person","name":"encukou"},"datePublished":"2022-06-03T12:35:03.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/93466/cpython/issues/93466"}