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[3.12] gh-117310: Remove extra DECREF on "no ciphers" error path in _ssl._SSLContext constructor (GH-117309) #117317

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merged 1 commit into from Mar 28, 2024
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[3.12] gh-117310: Remove extra DECREF on "no ciphers" error path in _ssl._SSLContext constructor (GH-117309) #117317

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4 changes: 4 additions & 0 deletions Misc/NEWS.d/next/Library/2024-03-27-21-05-52.gh-issue-117310.Bt2wox.rst
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@@ -0,0 +1,4 @@
Fixed an unlikely early & extra ``Py_DECREF`` triggered crash in :mod:`ssl`
when creating a new ``_ssl._SSLContext`` if CPython was built implausibly such
that the default cipher list is empty **or** the SSL library it was linked
against reports a failure from its C ``SSL_CTX_set_cipher_list()`` API.
1 change: 0 additions & 1 deletion Modules/_ssl.c
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Expand Up @@ -3143,7 +3143,6 @@ _ssl__SSLContext_impl(PyTypeObject *type, int proto_version)
result = SSL_CTX_set_cipher_list(ctx, "HIGH:!aNULL:!eNULL");
}
if (result == 0) {
Py_DECREF(self);
ERR_clear_error();
PyErr_SetString(get_state_ctx(self)->PySSLErrorObject,
"No cipher can be selected.");
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