commit bbbac2ec34e99c24d7bc0eedbcc138c5f4551d48
author Victor Stinner <victor.stinner@gmail.com> Thu Feb 07 23:12:46 2013 +0100
committer Victor Stinner <victor.stinner@gmail.com> Thu Feb 07 23:12:46 2013 +0100
tree d78b2fead0311d37b6f76d0a3466fd78196c8c31
parent 2efdc90b0f49866d857a5b3dc21b7c791f7a0aeb

Issue #17137: When an Unicode string is resized, the internal wide character
string (wstr) format is now cleared.

Objects/unicodeobject.c

diff --git a/Objects/unicodeobject.c b/Objects/unicodeobject.c
index abe793d..51160f8 100644
--- a/Objects/unicodeobject.c
+++ b/Objects/unicodeobject.c
@@ -702,6 +702,10 @@
         if (!PyUnicode_IS_ASCII(unicode))
             _PyUnicode_WSTR_LENGTH(unicode) = length;
     }
+    else if (_PyUnicode_HAS_WSTR_MEMORY(unicode)) {
+        PyObject_DEL(_PyUnicode_WSTR(unicode));
+        _PyUnicode_WSTR(unicode) = NULL;
+    }
     PyUnicode_WRITE(PyUnicode_KIND(unicode), PyUnicode_DATA(unicode),
                     length, 0);
     assert(_PyUnicode_CheckConsistency(unicode, 0));