Issue #17223: array module: Fix a crasher when converting an array containing

invalid characters (outside range [U+0000; U+10ffff]) to Unicode: repr(array),
str(array) and array.tounicode(). Patch written by Manuel Jacob.

Lib/test/test_array.py

@@ -1069,6 +1069,12 @@ class UnicodeTest(StringTest, unittest.TestCase):
 
         self.assertRaises(TypeError, a.fromunicode)
 
+    def test_issue17223(self):
+        # this used to crash
+        a = array.array('u', b'\xff' * 4)
+        self.assertRaises(ValueError, a.tounicode)
+        self.assertRaises(ValueError, str, a)
+
 class NumberTest(BaseTest):
 
     def test_extslice(self):

Misc/NEWS

@@ -12,6 +12,10 @@ What's New in Python 3.3.1?
 Core and Builtins
 -----------------
 
+- Issue #17223: array module: Fix a crasher when converting an array containing
+  invalid characters (outside range [U+0000; U+10ffff]) to Unicode:
+  repr(array), str(array) and array.tounicode(). Patch written by Manuel Jacob.
+
 - Issue #17223: Fix PyUnicode_FromUnicode() for string of 1 character outside
   the range U+0000-U+10ffff.
 

Modules/arraymodule.c

@@ -2180,6 +2180,8 @@ array_repr(arrayobject *a)
     } else {
         v = array_tolist(a, NULL);
     }
+    if (v == NULL)
+        return NULL;
 
     s = PyUnicode_FromFormat("array('%c', %R)", (int)typecode, v);
     Py_DECREF(v);