Issue #28648: Fixed crash in Py_DecodeLocale() in debug build on Mac OS X

when decode astral characters.

diff --cc Misc/NEWS
index 07d1b215ba79e92a3c75cf9989c61696e3275d01,d3489d1ecf95507642e799ad4fd360a97c8f484e..39ca04910a3a95fca34fbe24a7f361ac3dce1d59
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -10,8 -10,27 +10,11 @@@ Release date: TB
  Core and Builtins
  -----------------
  
 -- Issue #26171: Fix possible integer overflow and heap corruption in
 -  zipimporter.get_data().
 -
 -- Issue #25709: Fixed problem with in-place string concatenation and utf-8 cache.
 -
 -- Issue #24407: Fix crash when dict is mutated while being updated.
 -
 -- Issue #24097: Fixed crash in object.__reduce__() if slot name is freed inside
 -  __getattr__.
 -
 -- Issue #24096: Make warnings.warn_explicit more robust against mutation of the
 -  warnings.filters list.
 -
 -- Issue #24044: Fix possible null pointer dereference in list.sort in out of
 -  memory conditions.
 -
 -- Issue #23055: Fixed a buffer overflow in PyUnicode_FromFormatV.  Analysis
 -  and fix by Guido Vranken.
+ - Issue #28648: Fixed crash in Py_DecodeLocale() in debug build on Mac OS X
+   when decode astral characters.  Patch by Xiang Zhang.
+ 
 +- Issue #28426: Fixed potential crash in PyUnicode_AsDecodedObject() in debug
 +  build.
  
  Library
  -------

diff --cc Objects/unicodeobject.c
Simple merge