HDFS-1153. svn merge -c 1339706 from trunk

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1339713 13f79535-47bb-0310-9956-ffa450edef68

hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt

@@ -64,6 +64,9 @@ Release 2.0.1-alpha - UNRELEASED
 
     HDFS-3433. GetImageServlet should allow administrative requestors when security is enabled. (atm)
 
+    HDFS-1153. dfsnodelist.jsp should handle invalid input parameters.
+    (Ravi Phulari via eli)
+
 Release 2.0.0-alpha - UNRELEASED
 
   INCOMPATIBLE CHANGES

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/NamenodeJspHelper.java

@@ -587,6 +587,10 @@ class NamenodeJspHelper {
 
       whatNodes = request.getParameter("whatNodes"); // show only live or only
                                                      // dead nodes
+      if (null == whatNodes || whatNodes.isEmpty()) {
+        out.print("Invalid input");
+        return;
+      }
       sorterField = request.getParameter("sorter/field");
       sorterOrder = request.getParameter("sorter/order");
       if (sorterField == null)
@@ -714,6 +718,8 @@ class NamenodeJspHelper {
             }
             out.print("</table>\n");
           }
+        } else {
+          out.print("Invalid input");
         }
         out.print("</div>");
       }