From d23f2e5fe477725ef837afda1bf55de83cb2b446 Mon Sep 17 00:00:00 2001
From: Roger Dingledine <arma@torproject.org>
Date: Wed, 3 Dec 2003 10:04:44 +0000
Subject: [PATCH] stop segfault when choose_good_exit_server returns NULL

svn:r879
---
 trunk/src/or/onion.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/trunk/src/or/onion.c b/trunk/src/or/onion.c
index 4116557b12..0e5a5d5c0e 100644
--- a/trunk/src/or/onion.c
+++ b/trunk/src/or/onion.c
@@ -386,14 +386,18 @@ cpath_build_state_t *onion_new_cpath_build_state(void) {
   directory_t *dir;
   int r;
   cpath_build_state_t *info;
-  
+  routerinfo_t *exit;
+
   router_get_directory(&dir);
   r = new_route_len(options.PathlenCoinWeight, dir->routers, dir->n_routers);
   if (r < 0) 
     return NULL;
+  exit = choose_good_exit_server(dir);
+  if(!exit)
+    return NULL;
   info = tor_malloc(sizeof(cpath_build_state_t));
   info->desired_path_len = r;
-  info->chosen_exit = tor_strdup(choose_good_exit_server(dir)->nickname);
+  info->chosen_exit = tor_strdup(exit->nickname);
   return info;
 }