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cpython/Python
Petr Vaganov 10ed03edf1 gh-152682: Fix NULL dereference on OOM in symtable_visit_type_param_bound_or_default (#152684)
In `symtable_visit_type_param_bound_or_default()`, when a reserved name
(e.g. `__classdict__`) is used as a type parameter, `PyUnicode_FromFormat()`
is called to build the SyntaxError message. If the allocation fails and
returns NULL, the subsequent `PyErr_SetObject()` and `Py_DECREF()` calls
would dereference NULL, causing a segfault.

Fix by returning 0 immediately when `PyUnicode_FromFormat()` returns NULL.
This propagates the MemoryError set by `PyUnicode_FromFormat()`.

The bug was introduced in gh-128632 (commit 891c61c).
2026-06-30 14:45:25 +00:00
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Miscellaneous source files for the main Python shared library