From 77643c486fd22d8030e0d82c13012684b4ab6df1 Mon Sep 17 00:00:00 2001
From: animalize <animalize@users.noreply.github.com>
Date: Mon, 9 Sep 2019 21:46:26 +0800
Subject: [PATCH] bpo-38037: Fix reference counters in signal module (GH-15753)

---
 .../2019-09-09-18-39-23.bpo-38037.B0UgFU.rst  |  1 +
 Modules/signalmodule.c                        | 25 +++++++++++++------
 2 files changed, 18 insertions(+), 8 deletions(-)
 create mode 100644 Misc/NEWS.d/next/Library/2019-09-09-18-39-23.bpo-38037.B0UgFU.rst

diff --git a/Misc/NEWS.d/next/Library/2019-09-09-18-39-23.bpo-38037.B0UgFU.rst b/Misc/NEWS.d/next/Library/2019-09-09-18-39-23.bpo-38037.B0UgFU.rst
new file mode 100644
index 00000000000..607673bd999
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2019-09-09-18-39-23.bpo-38037.B0UgFU.rst
@@ -0,0 +1 @@
+Fix reference counters in the :mod:`signal` module.
diff --git a/Modules/signalmodule.c b/Modules/signalmodule.c
index 95569b931d6..1d99f877e16 100644
--- a/Modules/signalmodule.c
+++ b/Modules/signalmodule.c
@@ -1329,7 +1329,7 @@ static struct PyModuleDef signalmodule = {
 PyMODINIT_FUNC
 PyInit__signal(void)
 {
-    PyObject *m, *d, *x;
+    PyObject *m, *d;
     int i;
 
     /* Create the module and add the functions */
@@ -1350,13 +1350,17 @@ PyInit__signal(void)
     /* Add some symbolic constants to the module */
     d = PyModule_GetDict(m);
 
-    x = DefaultHandler = PyLong_FromVoidPtr((void *)SIG_DFL);
-    if (PyModule_AddObject(m, "SIG_DFL", x))
+    DefaultHandler = PyLong_FromVoidPtr((void *)SIG_DFL);
+    if (!DefaultHandler ||
+        PyDict_SetItemString(d, "SIG_DFL", DefaultHandler) < 0) {
         goto finally;
+    }
 
-    x = IgnoreHandler = PyLong_FromVoidPtr((void *)SIG_IGN);
-    if (PyModule_AddObject(m, "SIG_IGN", x))
+    IgnoreHandler = PyLong_FromVoidPtr((void *)SIG_IGN);
+    if (!IgnoreHandler ||
+        PyDict_SetItemString(d, "SIG_IGN", IgnoreHandler) < 0) {
         goto finally;
+    }
 
     if (PyModule_AddIntMacro(m, NSIG))
         goto finally;
@@ -1374,8 +1378,8 @@ PyInit__signal(void)
          goto finally;
 #endif
 
-    x = IntHandler = PyDict_GetItemString(d, "default_int_handler");
-    if (!x)
+    IntHandler = PyDict_GetItemString(d, "default_int_handler");
+    if (!IntHandler)
         goto finally;
     Py_INCREF(IntHandler);
 
@@ -1568,8 +1572,10 @@ PyInit__signal(void)
 #if defined (HAVE_SETITIMER) || defined (HAVE_GETITIMER)
     ItimerError = PyErr_NewException("signal.ItimerError",
             PyExc_OSError, NULL);
-    if (PyModule_AddObject(m, "ItimerError", ItimerError))
+    if (!ItimerError ||
+        PyDict_SetItemString(d, "ItimerError", ItimerError) < 0) {
         goto finally;
+    }
 #endif
 
 #ifdef CTRL_C_EVENT
@@ -1615,6 +1621,9 @@ finisignal(void)
     Py_CLEAR(IntHandler);
     Py_CLEAR(DefaultHandler);
     Py_CLEAR(IgnoreHandler);
+#ifdef HAVE_GETITIMER
+    Py_CLEAR(ItimerError);
+#endif
 }