From ce7f22928ddbf03e44cdea12e4040cbd1cc61879 Mon Sep 17 00:00:00 2001
From: Marc Kleine-Budde <mkl@pengutronix.de>
Date: Tue, 29 Sep 2020 09:03:35 +0200
Subject: [PATCH] canfdtest: bail out if trying to use non-existing CAN
 interface

Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 canfdtest.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/canfdtest.c b/canfdtest.c
index b9f29ee..1a0f50a 100644
--- a/canfdtest.c
+++ b/canfdtest.c
@@ -422,6 +422,11 @@ int main(int argc, char *argv[])
 
 	addr.can_family = family;
 	addr.can_ifindex = if_nametoindex(intf_name);
+	if (!addr.can_ifindex) {
+		perror("if_nametoindex");
+		close(sockfd);
+		return 1;
+	}
 
 	if (bind(sockfd, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
 		perror("bind");