#11335: Fix memory leak when a sort key function throws an exception

Misc/NEWS

@@ -10,6 +10,9 @@ What's New in Python 3.3 Alpha 1?
 Core and Builtins
 -----------------
 
+- Issue #11335: Fixed a memory leak in list.sort when the key function
+  throws an exception.
+
 - Issue #8923: When a string is encoded to UTF-8 in strict mode, the result is
   cached into the object. Examples: str.encode(), str.encode('utf-8'),
   PyUnicode_AsUTF8String() and PyUnicode_AsEncodedString(unicode, "utf-8",

Objects/listobject.c

@@ -1957,6 +1957,8 @@ listsort(PyListObject *self, PyObject *args, PyObject *kwds)
             if (keys[i] == NULL) {
                 for (i=i-1 ; i>=0 ; i--)
                     Py_DECREF(keys[i]);
+                if (keys != &ms.temparray[saved_ob_size+1])
+                    PyMem_FREE(keys);
                 goto keyfunc_fail;
             }
         }