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Title: gh-152682: Fix NULL dereference on OOM in symtable_visit_type_param_bound_or_default by petrvaganoff · Pull Request #152684 · python/cpython · GitHub

Open Graph Title: gh-152682: Fix NULL dereference on OOM in symtable_visit_type_param_bound_or_default by petrvaganoff · Pull Request #152684 · python/cpython

X Title: gh-152682: Fix NULL dereference on OOM in symtable_visit_type_param_bound_or_default by petrvaganoff · Pull Request #152684 · python/cpython

Description: When a reserved name (e.g. __classdict__) is used as a type parameter, symtable_visit_type_param_bound_or_default() calls PyUnicode_FromFormat() to build the SyntaxError message. If the allocation fails and returns NULL, the subsequent PyErr_SetObject(PyExc_SyntaxError, NULL) and Py_DECREF(NULL) calls dereference the null pointer, causing a segfault. Fix by returning 0 immediately when PyUnicode_FromFormat() returns NULL, which propagates the MemoryError already set by PyUnicode_FromFormat(). The bug was introduced in gh-128632 (commit 891c61c). Found by static analyzer Svace (ISP RAS). Add a NEWS entry in Misc/NEWS.d/ Add regression test (test_disallowed_type_param_names_oom) Issue: gh-152682

Open Graph Description: When a reserved name (e.g. __classdict__) is used as a type parameter, symtable_visit_type_param_bound_or_default() calls PyUnicode_FromFormat() to build the SyntaxError message. If the allocation ...

X Description: When a reserved name (e.g. __classdict__) is used as a type parameter, symtable_visit_type_param_bound_or_default() calls PyUnicode_FromFormat() to build the SyntaxError message. If the allocation ...

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ad57b62 gh-152682: Fix NULL dereference on OOM in symtable_visit_type_param_b… petrvaganoff Jun 30, 2026	https://github.com/python/cpython/pull/152684/commits/ad57b623b5c762bc286620ca1b45855bd223779d
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