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gh-83004: Clean up refleaks in ssl, socket initialisation by hauntsaninja · Pull Request #99044 · python/cpython · GitHub

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gh-83004: Clean up refleaks in ssl, socket initialisation #99044

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gh-83004: Clean up refleaks in ssl, socket initialisation #99044

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gh-83004: Clean up refleaks in ssl, socket initialisation
hauntsaninja Nov 3, 2022
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📜🤖 Added by blurb_it.
blurb-it[bot] Nov 3, 2022
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1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Library/2022-11-03-06-41-49.gh-issue-83004.301VK_.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1 @@
Clean up refleaks on failed module initialisation in in :mod:`_ssl` and :mod:`_socket`
19 changes: 13 additions & 6 deletions Modules/_ssl.c
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Expand Up @@ -5925,8 +5925,7 @@ sslmodule_init_constants(PyObject *m)
#define addbool(m, key, value) \
do { \
PyObject *bool_obj = (value) ? Py_True : Py_False; \
Py_INCREF(bool_obj); \
PyModule_AddObject((m), (key), bool_obj); \
PyModule_AddObjectRef((m), (key), bool_obj); \

JelleZijlstra Nov 6, 2022

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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

Isn't this still a leak because we're not checking the return value?

hauntsaninja Nov 6, 2022

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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

It's no longer a leak.

The thing that makes PyModule_AddObject tricky cause leaks is that you have to decref in the failure case, but not in the success case (because it steals the ref). With PyModule_AddObjectRef you can treat the failure and success cases the same in terms of what they do to ref counts.

But yes, in general we should probably be propagating failures here, and the other cases below you commented on. I didn't do it in this PR because it's a slightly separate change and there are many other places in this module where we don't check return values.

hauntsaninja Nov 6, 2022 •
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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

Should I check return values for just the ones I'm touching in this PR or fix all of them?

JelleZijlstra Nov 6, 2022

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Thanks for the explanation! I feel it'd be fine to also fix missing error checks in this PR, since the change remains localized and you're fixing a very similar problem to what the PR already fixes.
} while (0)

addbool(m, "HAS_SNI", 1);
Expand Down Expand Up @@ -6059,23 +6058,31 @@ sslmodule_init_versioninfo(PyObject *m)
*/
libver = OpenSSL_version_num();
r = PyLong_FromUnsignedLong(libver);
if (r == NULL || PyModule_AddObject(m, "OPENSSL_VERSION_NUMBER", r))
if (r == NULL || PyModule_AddObject(m, "OPENSSL_VERSION_NUMBER", r)) {
Py_XDECREF(r);
return -1;
}

parse_openssl_version(libver, &major, &minor, &fix, &patch, &status);
r = Py_BuildValue("IIIII", major, minor, fix, patch, status);
if (r == NULL || PyModule_AddObject(m, "OPENSSL_VERSION_INFO", r))
if (r == NULL || PyModule_AddObject(m, "OPENSSL_VERSION_INFO", r)) {
Py_XDECREF(r);
return -1;
}

r = PyUnicode_FromString(OpenSSL_version(OPENSSL_VERSION));
if (r == NULL || PyModule_AddObject(m, "OPENSSL_VERSION", r))
if (r == NULL || PyModule_AddObject(m, "OPENSSL_VERSION", r)) {
Py_XDECREF(r);
return -1;
}

libver = OPENSSL_VERSION_NUMBER;
parse_openssl_version(libver, &major, &minor, &fix, &patch, &status);
r = Py_BuildValue("IIIII", major, minor, fix, patch, status);
if (r == NULL || PyModule_AddObject(m, "_OPENSSL_API_VERSION", r))
if (r == NULL || PyModule_AddObject(m, "_OPENSSL_API_VERSION", r)) {
Py_XDECREF(r);
return -1;
}

return 0;
}
Expand Down
31 changes: 14 additions & 17 deletions Modules/socketmodule.c
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Original file line number Diff line number Diff line change
Expand Up @@ -7342,38 +7342,34 @@ PyInit__socket(void)
if (m == NULL)
return NULL;

Py_INCREF(PyExc_OSError);
PyModule_AddObject(m, "error", PyExc_OSError);
if (PyModule_AddObjectRef(m, "error", PyExc_OSError) != 0)
return NULL;
socket_herror = PyErr_NewException("socket.herror",
PyExc_OSError, NULL);
if (socket_herror == NULL)
return NULL;
Py_INCREF(socket_herror);
PyModule_AddObject(m, "herror", socket_herror);
if (PyModule_AddObjectRef(m, "herror", socket_herror) != 0)
return NULL;
socket_gaierror = PyErr_NewException("socket.gaierror", PyExc_OSError,
NULL);
NULL);
if (socket_gaierror == NULL)
return NULL;
Py_INCREF(socket_gaierror);
PyModule_AddObject(m, "gaierror", socket_gaierror);
PyModule_AddObjectRef(m, "timeout", PyExc_TimeoutError);
if (PyModule_AddObjectRef(m, "gaierror", socket_gaierror) != 0)
return NULL;
if (PyModule_AddObjectRef(m, "timeout", PyExc_TimeoutError) != 0)
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return NULL;

Py_INCREF((PyObject *)&sock_type);
if (PyModule_AddObject(m, "SocketType",
(PyObject *)&sock_type) != 0)
if (PyModule_AddObjectRef(m, "SocketType", (PyObject *)&sock_type) != 0)
return NULL;
Py_INCREF((PyObject *)&sock_type);
if (PyModule_AddObject(m, "socket",
(PyObject *)&sock_type) != 0)
if (PyModule_AddObjectRef(m, "socket", (PyObject *)&sock_type) != 0)
return NULL;

#ifdef ENABLE_IPV6
has_ipv6 = Py_True;
#else
has_ipv6 = Py_False;
#endif
Py_INCREF(has_ipv6);
PyModule_AddObject(m, "has_ipv6", has_ipv6);
PyModule_AddObjectRef(m, "has_ipv6", has_ipv6);

JelleZijlstra Nov 6, 2022

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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

Check the return value.

/* Export C API */
PySocketModule_APIObject *capi = sock_get_api();
Expand Down Expand Up @@ -8666,7 +8662,8 @@ PyInit__socket(void)
tmp = PyLong_FromUnsignedLong(codes[i]);
if (tmp == NULL)
return NULL;
PyModule_AddObject(m, names[i], tmp);
PyModule_AddObjectRef(m, names[i], tmp);

JelleZijlstra Nov 6, 2022

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Here too.
Py_DECREF(tmp);
}
}
PyModule_AddIntMacro(m, RCVALL_OFF);
Expand Down
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