- Liam Healy filed the debian bug report #480044

(http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=480044) identifying a
  segfault when using krb5 ftp, but the krb4 code had the same problem.

lib/ftp.c

@@ -622,9 +622,13 @@ CURLcode Curl_GetFTPResponse(ssize_t *nreadp, /* return number of bytes read */
   struct timeval now = Curl_tvnow();
   size_t nread;
   int cache_skip=0;
+  int value_to_be_ignored=0;
 
   if(ftpcode)
     *ftpcode = 0; /* 0 for errors */
+  else
+    /* make the pointer point to something for the rest of this function */
+    ftpcode = &value_to_be_ignored;
 
   *nreadp=0;