[ospf6d] Fix ospf6d crash if range defined twice

ospf6d will crash if the same range is defined twice.
There was no check if the same range had previously been defined,
thereby causing a later assert to fail.

1 files changed, 6 insertions, 0 deletions

diff --git a/ospf6d/ospf6_area.c b/ospf6d/ospf6_area.c
index 3bfc0cae5..3c999bbcc 100644
--- a/ospf6d/ospf6_area.c
+++ b/ospf6d/ospf6_area.c
@@ -353,6 +353,12 @@ DEFUN (area_range,
         UNSET_FLAG (range->flag, OSPF6_ROUTE_DO_NOT_ADVERTISE);
     }
 
+  if (range->rnode)
+    {
+      vty_out (vty, "Range already defined: %s%s", argv[-1], VNL);
+      return CMD_WARNING;
+    }
+
   ospf6_route_add (range, oa->range_table);
   return CMD_SUCCESS;
 }