diff -r 4a48450f2505 Lib/test/test_minidom.py
--- a/Lib/test/test_minidom.py	Sat Jun 14 20:41:22 2014 -0700
+++ b/Lib/test/test_minidom.py	Mon Jun 16 00:00:05 2014 +0300
@@ -1531,6 +1531,13 @@
         num_children_after = len(doc.childNodes)
         self.assertTrue(num_children_after == num_children_before - 1)
 
+    def testProcessingInstructionNameError(self):
+        # wrong variable in .nodeValue property will
+        # lead to "NameError: name 'data' is not defined"
+        doc = parse(tstfile)
+        pi = doc.createProcessingInstruction("y", "z")
+        pi.nodeValue = "crash"
+
 def test_main():
     run_unittest(MinidomTest)
 
diff -r 4a48450f2505 Lib/xml/dom/minidom.py
--- a/Lib/xml/dom/minidom.py	Sat Jun 14 20:41:22 2014 -0700
+++ b/Lib/xml/dom/minidom.py	Mon Jun 16 00:00:05 2014 +0300
@@ -976,7 +976,7 @@
     def _get_nodeValue(self):
         return self.data
     def _set_nodeValue(self, value):
-        self.data = data
+        self.data = value
     nodeValue = property(_get_nodeValue, _set_nodeValue)
 
     # nodeName is an alias for target