From c45890e15c144e1da39ed5eccbef3bc0de0a1226 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Carlos=20Mart=C3=ADn?= <cmartins@fdi.ucm.es>
Date: Tue, 29 Nov 2011 15:50:54 +0100
Subject: [PATCH] Bug in FixedLeases::add_leases, fix potential pointer
 exception

---
 src/vnm/FixedLeases.cc | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/src/vnm/FixedLeases.cc b/src/vnm/FixedLeases.cc
index 83180c2a92..abfd653ef9 100644
--- a/src/vnm/FixedLeases.cc
+++ b/src/vnm/FixedLeases.cc
@@ -365,13 +365,17 @@ int FixedLeases::update_lease(Lease * lease)
 int FixedLeases::add_leases(vector<const Attribute*>&   vector_leases,
                             string&                     error_msg)
 {
-    const VectorAttribute * single_attr_lease;
+    const VectorAttribute * single_attr_lease = 0;
 
     int     rc = -1;
     string  _mac;
     string  _ip;
 
-    single_attr_lease = dynamic_cast<const VectorAttribute *>(vector_leases[0]);
+    if ( vector_leases.size() > 0 )
+    {
+        single_attr_lease =
+                dynamic_cast<const VectorAttribute *>(vector_leases[0]);
+    }
 
     if( single_attr_lease != 0 )
     {
@@ -400,11 +404,15 @@ int FixedLeases::add_leases(vector<const Attribute*>&   vector_leases,
 int FixedLeases::remove_leases(vector<const Attribute*>&   vector_leases,
                                string&                     error_msg)
 {
-    const VectorAttribute * single_attr_lease;
+    const VectorAttribute * single_attr_lease = 0;
     int     rc = -1;
     string  _ip;
 
-    single_attr_lease = dynamic_cast<const VectorAttribute *>(vector_leases[0]);
+    if ( vector_leases.size() > 0 )
+    {
+        single_attr_lease =
+                dynamic_cast<const VectorAttribute *>(vector_leases[0]);
+    }
 
     if( single_attr_lease != 0 )
     {