From f359e10f6799d0ba99abdd760ae28b46e409230f Mon Sep 17 00:00:00 2001
From: Chris Hofstaedtler <chris.hofstaedtler@deduktiva.com>
Date: Mon, 27 Nov 2017 15:32:05 +0100
Subject: [PATCH] sdig: avoid segfault when ednssubnet is given with no arg

---
 pdns/sdig.cc | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/pdns/sdig.cc b/pdns/sdig.cc
index bcd2bbeb0..61a954a59 100644
--- a/pdns/sdig.cc
+++ b/pdns/sdig.cc
@@ -71,7 +71,12 @@ try
       if (strcmp(argv[i], "tcp") == 0)
         tcp=true;
       if (strcmp(argv[i], "ednssubnet") == 0) {
-        ednsnm=Netmask(argv[++i]);
+        i++;
+        if (argc == i) {
+          usage();
+          exit(EXIT_FAILURE);
+        }
+        ednsnm=Netmask(argv[i]);
       }
     }
   }
-- 
2.50.1