From f2a6eedded9d4dc3c854c1e3091d1f6278ac6e7f Mon Sep 17 00:00:00 2001
From: Nick Mathewson <nickm@torproject.org>
Date: Mon, 7 May 2012 15:22:17 -0400
Subject: Fix a crash bug on SETCIRCUITPURPOSE.

---
 src/or/control.c | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'src')

diff --git a/src/or/control.c b/src/or/control.c
index ddfc80e8fd..b41b291061 100644
--- a/src/or/control.c
+++ b/src/or/control.c
@@ -2389,6 +2389,10 @@ handle_control_setcircuitpurpose(control_connection_t *conn,
 
   {
     const char *purp = find_element_starting_with(args,1,"PURPOSE=");
+    if (!purp) {
+      connection_write_str_to_buf("552 No purpose given\r\n", conn);
+      goto done;
+    }
     new_purpose = circuit_purpose_from_string(purp);
     if (new_purpose == CIRCUIT_PURPOSE_UNKNOWN) {
       connection_printf_to_buf(conn, "552 Unknown purpose \"%s\"\r\n", purp);
-- 
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