samples: bpf: user proper argument index

Use optind as index for argv instead of a hardcoded value.
When the program has options this leads to improper parameter handling.

Fixes: dc378a1ab5b6 ("samples: bpf: get ifindex from ifname")
Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
Acked-by: Matteo Croce <mcroce@redhat.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

diff --git a/samples/bpf/xdp1_user.c b/samples/bpf/xdp1_user.c
index 0a197f8..8bfda95 100644 (file)
--- a/samples/bpf/xdp1_user.c
+++ b/samples/bpf/xdp1_user.c
@@ -103,7 +103,7 @@ int main(int argc, char **argv)
                return 1;
        }
 
-       ifindex = if_nametoindex(argv[1]);
+       ifindex = if_nametoindex(argv[optind]);
        if (!ifindex) {
                perror("if_nametoindex");
                return 1;