Fix a couple more node_t-related nullpointer bugs

src/or/circuituse.c

@@ -1313,7 +1313,7 @@ circuit_get_open_circ_or_launch(edge_connection_t *conn,
         const node_t *r;
         int opt = conn->chosen_exit_optional;
         r = node_get_by_nickname(conn->chosen_exit_name, 1);
-        if (r) {
+        if (r && node_has_descriptor(r)) {
           extend_info = extend_info_from_node(r);
         } else {
           log_debug(LD_DIR, "considering %d, %s",

src/or/nodelist.c

@@ -514,6 +514,7 @@ node_get_by_nickname(const char *nickname, int warn_if_unnamed)
 const char *
 node_get_nickname(const node_t *node)
 {
+  tor_assert(node);
   if (node->rs)
     return node->rs->nickname;
   else if (node->ri)

src/or/routerlist.c

@@ -1321,9 +1321,13 @@ nodelist_add_node_family(smartlist_t *sl, const node_t *node)
 {
   /* XXXX MOVE */
   const smartlist_t *all_nodes = nodelist_get_list();
-  const smartlist_t *declared_family = node_get_declared_family(node);
+  const smartlist_t *declared_family;
   or_options_t *options = get_options();
 
+  tor_assert(node);
+
+  declared_family = node_get_declared_family(node);
+
   /* First, add any nodes with similar network addresses. */
   if (options->EnforceDistinctSubnets) {
     tor_addr_t node_addr;
@@ -1334,7 +1338,7 @@ nodelist_add_node_family(smartlist_t *sl, const node_t *node)
       node_get_addr(node2, &a);
       if (addrs_in_same_network_family(&a, &node_addr))
         smartlist_add(sl, (void*)node2);
-    } SMARTLIST_FOREACH_END(node);
+    } SMARTLIST_FOREACH_END(node2);
   }
 
   /* Now, add all nodes in the declared_family of this node, if they
@@ -1349,12 +1353,12 @@ nodelist_add_node_family(smartlist_t *sl, const node_t *node)
         continue;
       if (!(family2 = node_get_declared_family(node2)))
         continue;
-      SMARTLIST_FOREACH(family2, const char *, name2, {
+      SMARTLIST_FOREACH_BEGIN(family2, const char *, name2) {
           if (node_nickname_matches(node, name2)) {
             smartlist_add(sl, (void*)node2);
             break;
           }
-        });
+      } SMARTLIST_FOREACH_END(name2);
     } SMARTLIST_FOREACH_END(name);
   }