`_ssl.c` does not handle errors on module creation

[sobolevn]

Bug report

sslmodule_init_constants does not return -1 when any of PyModule_Add* calls fail.

For example, PyModule_AddIntConstant returns -1 on error, but it is never checked:

cpython/Modules/_ssl.c

Lines 5790 to 5831 in 96cbd1e

	PyModule_AddStringConstant(m, "_DEFAULT_CIPHERS",
	PY_SSL_DEFAULT_CIPHER_STRING);
	PyModule_AddIntConstant(m, "SSL_ERROR_ZERO_RETURN",
	PY_SSL_ERROR_ZERO_RETURN);
	PyModule_AddIntConstant(m, "SSL_ERROR_WANT_READ",
	PY_SSL_ERROR_WANT_READ);
	PyModule_AddIntConstant(m, "SSL_ERROR_WANT_WRITE",
	PY_SSL_ERROR_WANT_WRITE);
	PyModule_AddIntConstant(m, "SSL_ERROR_WANT_X509_LOOKUP",
	PY_SSL_ERROR_WANT_X509_LOOKUP);
	PyModule_AddIntConstant(m, "SSL_ERROR_SYSCALL",
	PY_SSL_ERROR_SYSCALL);
	PyModule_AddIntConstant(m, "SSL_ERROR_SSL",
	PY_SSL_ERROR_SSL);
	PyModule_AddIntConstant(m, "SSL_ERROR_WANT_CONNECT",
	PY_SSL_ERROR_WANT_CONNECT);
	/* non ssl.h errorcodes */
	PyModule_AddIntConstant(m, "SSL_ERROR_EOF",
	PY_SSL_ERROR_EOF);
	PyModule_AddIntConstant(m, "SSL_ERROR_INVALID_ERROR_CODE",
	PY_SSL_ERROR_INVALID_ERROR_CODE);
	/* cert requirements */
	PyModule_AddIntConstant(m, "CERT_NONE",
	PY_SSL_CERT_NONE);
	PyModule_AddIntConstant(m, "CERT_OPTIONAL",
	PY_SSL_CERT_OPTIONAL);
	PyModule_AddIntConstant(m, "CERT_REQUIRED",
	PY_SSL_CERT_REQUIRED);
	/* CRL verification for verification_flags */
	PyModule_AddIntConstant(m, "VERIFY_DEFAULT",
	0);
	PyModule_AddIntConstant(m, "VERIFY_CRL_CHECK_LEAF",
	X509_V_FLAG_CRL_CHECK);
	PyModule_AddIntConstant(m, "VERIFY_CRL_CHECK_CHAIN",
	X509_V_FLAG_CRL_CHECK|X509_V_FLAG_CRL_CHECK_ALL);
	PyModule_AddIntConstant(m, "VERIFY_X509_STRICT",
	X509_V_FLAG_X509_STRICT);
	PyModule_AddIntConstant(m, "VERIFY_ALLOW_PROXY_CERTS",
	X509_V_FLAG_ALLOW_PROXY_CERTS);
	PyModule_AddIntConstant(m, "VERIFY_X509_TRUSTED_FIRST",
	X509_V_FLAG_TRUSTED_FIRST);

Other ``sslmodule_init_*` functions do check for errors correctly.
I have a PR ready.

Linked PRs

• gh-111230: Fix _ssl.c not checking for errors when initializing a module #111232

[hugovk]

Thanks!