Issue #28426: Fixed potential crash in PyUnicode_AsDecodedObject() in debug build.

Misc/NEWS

@@ -10,6 +10,9 @@ What's New in Python 3.7.0 alpha 1
 Core and Builtins
 -----------------
 
+- Issue #28426: Fixed potential crash in PyUnicode_AsDecodedObject() in debug
+  build.
+
 - Issue #28517: Fixed of-by-one error in the peephole optimizer that caused
   keeping unreachable code.
 

Objects/unicodeobject.c

@@ -3232,24 +3232,16 @@ PyUnicode_AsDecodedObject(PyObject *unicode,
                           const char *encoding,
                           const char *errors)
 {
-    PyObject *v;
-
     if (!PyUnicode_Check(unicode)) {
         PyErr_BadArgument();
-        goto onError;
+        return NULL;
     }
 
     if (encoding == NULL)
         encoding = PyUnicode_GetDefaultEncoding();
 
     /* Decode via the codec registry */
-    v = PyCodec_Decode(unicode, encoding, errors);
-    if (v == NULL)
-        goto onError;
-    return unicode_result(v);
-
-  onError:
-    return NULL;
+    return PyCodec_Decode(unicode, encoding, errors);
 }
 
 PyObject *