ospf6d: Fix memory allocation issues in SPF

* ospf6_area.c: Call ospf6_spf_table_finish() before deleting the spf
    table.  This ensures that the associated ospf6_vertex structures
    are also freed.
* ospf6_spf.c: Only allocate a priority queue when a spf calculation
    is actually performed.  Also defer calling ospf6_spf_table_finish().

2 files changed, 8 insertions, 6 deletions

diff --git a/ospf6d/ospf6_area.c b/ospf6d/ospf6_area.c
index 3c999bbc..bf8dbc33 100644
--- a/ospf6d/ospf6_area.c
+++ b/ospf6d/ospf6_area.c
@@ -199,6 +199,7 @@ ospf6_area_delete (struct ospf6_area *oa)
   ospf6_lsdb_delete (oa->lsdb);
   ospf6_lsdb_delete (oa->lsdb_self);
 
+  ospf6_spf_table_finish (oa->spf_table);
   ospf6_route_table_delete (oa->spf_table);
   ospf6_route_table_delete (oa->route_table);
 
diff --git a/ospf6d/ospf6_spf.c b/ospf6d/ospf6_spf.c
index 04367f08..cb549618 100644
--- a/ospf6d/ospf6_spf.c
+++ b/ospf6d/ospf6_spf.c
@@ -392,18 +392,19 @@ ospf6_spf_calculation (u_int32_t router_id,
   caddr_t lsdesc;
   struct ospf6_lsa *lsa;
 
-  /* initialize */
-  candidate_list = pqueue_create ();
-  candidate_list->cmp = ospf6_vertex_cmp;
-
-  ospf6_spf_table_finish (result_table);
-
   /* Install the calculating router itself as the root of the SPF tree */
   /* construct root vertex */
   lsa = ospf6_lsdb_lookup (htons (OSPF6_LSTYPE_ROUTER), htonl (0),
                            router_id, oa->lsdb);
   if (lsa == NULL)
     return;
+
+  /* initialize */
+  candidate_list = pqueue_create ();
+  candidate_list->cmp = ospf6_vertex_cmp;
+
+  ospf6_spf_table_finish (result_table);
+
   root = ospf6_vertex_create (lsa);
   root->area = oa;
   root->cost = 0;