From dc078947a5033a048d804e244e847b5844734439 Mon Sep 17 00:00:00 2001
From: Davide Rizzo <sorcio@gmail.com>
Date: Wed, 6 Mar 2019 18:08:31 +0100
Subject: [PATCH] bpo-36139: Fix mmap_object_dealloc(): hold the GIL to call
 PyMem_Free() (GH-12199)

---
 Modules/mmapmodule.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/Modules/mmapmodule.c b/Modules/mmapmodule.c
index 326288cccd..6ddbf70d9a 100644
--- a/Modules/mmapmodule.c
+++ b/Modules/mmapmodule.c
@@ -117,26 +117,28 @@ typedef struct {
 static void
 mmap_object_dealloc(mmap_object *m_obj)
 {
-    Py_BEGIN_ALLOW_THREADS
 #ifdef MS_WINDOWS
+    Py_BEGIN_ALLOW_THREADS
     if (m_obj->data != NULL)
         UnmapViewOfFile (m_obj->data);
     if (m_obj->map_handle != NULL)
         CloseHandle (m_obj->map_handle);
     if (m_obj->file_handle != INVALID_HANDLE_VALUE)
         CloseHandle (m_obj->file_handle);
+    Py_END_ALLOW_THREADS
     if (m_obj->tagname)
         PyMem_Free(m_obj->tagname);
 #endif /* MS_WINDOWS */
 
 #ifdef UNIX
+    Py_BEGIN_ALLOW_THREADS
     if (m_obj->fd >= 0)
         (void) close(m_obj->fd);
     if (m_obj->data!=NULL) {
         munmap(m_obj->data, m_obj->size);
     }
-#endif /* UNIX */
     Py_END_ALLOW_THREADS
+#endif /* UNIX */
 
     if (m_obj->weakreflist != NULL)
         PyObject_ClearWeakRefs((PyObject *) m_obj);
-- 
2.40.0