candump: Add support for hardware timestamping

[can-utils.git] / cangw.c

diff --git a/cangw.c b/cangw.c
index ff76fd71b68a9c4c068aa214c627041c2802a7ca..f408993b235fd24563cc40e31d32bd451345dc07 100644 (file)
--- a/cangw.c
+++ b/cangw.c
@@ -602,10 +602,18 @@ int main(int argc, char **argv)
 
                case 's':
                        src_ifindex = if_nametoindex(optarg);
+                       if (src_ifindex == 0) {
+                               perror(optarg);
+                               return 1;
+                       }
                        break;
 
                case 'd':
                        dst_ifindex = if_nametoindex(optarg);
+                       if (dst_ifindex == 0) {
+                               perror(optarg);
+                               return 1;
+                       }
                        break;
 
                case 't':