Fixed crash from check_nt when -H unspecified or given multiple times (sf.net #2731755, debian #521097)

1 files changed, 2 insertions, 1 deletions

diff --git a/plugins/check_nt.c b/plugins/check_nt.c
index ec944e4c..d038efe7 100644
--- a/plugins/check_nt.c
+++ b/plugins/check_nt.c
@@ -522,7 +522,6 @@ int process_arguments(int argc, char **argv){
                                 print_revision(progname, NP_VERSION);
                                 exit(STATE_OK);
                         case 'H': /* hostname */
-                                if (server_address)     free(server_address);
                                 server_address = optarg;
                                 break;
                         case 's': /* password */
@@ -585,6 +584,8 @@ int process_arguments(int argc, char **argv){
                         }
 
         }
+        if (server_address == NULL)
+                usage4 (_("You must provide a server address or host name"));
 
         if (vars_to_check==CHECK_NONE)
                 return ERROR;