From 4e84ee69e7af21fe4cf357677739a32744f07e49 Mon Sep 17 00:00:00 2001
From: Sami Kerola <kerolasa@iki.fi>
Date: Tue, 11 Oct 2016 21:20:50 +0100
Subject: [PATCH] user interface: do not allow out of range --ipinfo arguments

Likewise --displaymode and --port.
---
 mtr.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/mtr.c b/mtr.c
index a68fe14..4ff0258 100644
--- a/mtr.c
+++ b/mtr.c
@@ -549,8 +549,9 @@ static void parse_arg (struct mtr_ctl *ctl, names_t **names, int argc, char **ar
 #ifdef HAVE_IPINFO
     case 'y':
       ctl->ipinfo_no = strtonum_or_err(optarg, "invalid argument", STRTO_INT);
-      if (ctl->ipinfo_no < 0)
-        ctl->ipinfo_no = 0;
+      if (ctl->ipinfo_no < 0 || 4 < ctl->ipinfo_no) {
+        error(EXIT_FAILURE, 0, "value %d out of range (0 - 4)", ctl->ipinfo_no);
+      }
       break;
     case 'z':
       ctl->ipinfo_no = 0;
-- 
2.47.2