Index: common/lib/libc/gen/rb.c
===================================================================
RCS file: /cvsroot/src/common/lib/libc/gen/rb.c,v
retrieving revision 1.11
diff -p -u -r1.11 rb.c
--- common/lib/libc/gen/rb.c	20 Jun 2011 09:11:16 -0000	1.11
+++ common/lib/libc/gen/rb.c	22 Aug 2014 17:05:14 -0000
@@ -145,7 +145,7 @@ rb_tree_find_node_geq(struct rb_tree *rb
 		parent = parent->rb_nodes[diff < 0];
 	}
 
-	return RB_NODETOITEM(rbto, last);
+	return (last == NULL? NULL : RB_NODETOITEM(rbto, last));
 }
 
 void *
@@ -166,7 +166,7 @@ rb_tree_find_node_leq(struct rb_tree *rb
 		parent = parent->rb_nodes[diff < 0];
 	}
 
-	return RB_NODETOITEM(rbto, last);
+	return (last == NULL? NULL : RB_NODETOITEM(rbto, last));
 }
 
 void *