Fix unicode_aswidechar() for 4b unicode and 2b wchar_t (AIX).

2 files changed, 7 insertions, 1 deletions

diff --git a/Misc/NEWS b/Misc/NEWS
index 5b84414a3f..14d9630a8f 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -7,6 +7,12 @@ What's New in Python 3.2.6?
 
 *Release date: TBD*
 
+Core and Builtins
+-----------------
+
+- Issue #19529: Fix a potential crash in converting Unicode objects to wchar_t
+  when Py_UNICODE is 4 bytes but wchar_t is 2 bytes, for example on AIX.
+
 Library
 -------
 
diff --git a/Objects/unicodeobject.c b/Objects/unicodeobject.c
index cd4e9e9295..b7988509fb 100644
--- a/Objects/unicodeobject.c
+++ b/Objects/unicodeobject.c
@@ -1267,7 +1267,7 @@ unicode_aswidechar(PyUnicodeObject *unicode,
     Py_ssize_t nchar;
 
     u = PyUnicode_AS_UNICODE(unicode);
-    uend = u + PyUnicode_GET_SIZE(u);
+    uend = u + PyUnicode_GET_SIZE(unicode);
     if (w != NULL) {
         worig = w;
         wend = w + size;