The return value of if_nametoindex should be checked before the rtnl query is send to the kernel. Otherwise we might try to operate on an ifindex which doesn't exist in the kernel - which will never register any interface.

Fixes: a34f044de561 ("alfred: vis: Use rtnl to query list of hardifs of meshif") Signed-off-by: Sven Eckelmann sven@narfation.org --- vis/vis.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/vis/vis.c b/vis/vis.c index 8df3056..cdc5524 100644 --- a/vis/vis.c +++ b/vis/vis.c @@ -617,7 +617,7 @@ static int register_interfaces(struct globals *globals) };

register_arg.ifindex = if_nametoindex(globals->interface); - if (!globals->interface) + if (!register_arg.ifindex) return EXIT_FAILURE;