From 9a3134494188611a2866f6e2406296d43913cd4e Mon Sep 17 00:00:00 2001
From: Daniel Borkmann <dborkman@redhat.com>
Date: Mon, 17 Jun 2013 22:45:53 +0200
Subject: [PATCH] dev: bail out if ifindex could not be retrieved

If we fail to find the ifindex of a given device, bail out.

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
---
 dev.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/dev.c b/dev.c
index 210487ce..6488f4ab 100644
--- a/dev.c
+++ b/dev.c
@@ -9,6 +9,7 @@
 #include "sock.h"
 #include "die.h"
 #include "link.h"
+#include "built_in.h"
 
 int device_ifindex(const char *ifname)
 {
@@ -24,11 +25,10 @@ int device_ifindex(const char *ifname)
 	strlcpy(ifr.ifr_name, ifname, IFNAMSIZ);
 
 	ret = ioctl(sock, SIOCGIFINDEX, &ifr);
-	if (!ret)
-		index = ifr.ifr_ifindex;
-	else
-		index = -1;
+	if (unlikely(ret))
+		panic("Cannot get ifindex from device!\n");
 
+	index = ifr.ifr_ifindex;
 	close(sock);
 
 	return index;
-- 
2.11.4.GIT