ensure that iface->proto_handler gets initialized

diff --git a/proto.c b/proto.c
index bd3b09ae7d2748f665ea1138d20e29edd0aab4ae..c51637f32dac82697eed3bb00ab6637c0cdf82f5 100644 (file)
--- a/proto.c
+++ b/proto.c
@@ -160,9 +160,10 @@ proto_init_interface(struct interface *iface, struct blob_attr *attr)
        const struct proto_handler *proto = iface->proto_handler;
        struct interface_proto_state *state = NULL;
 
-       if (proto)
-               state = proto->attach(proto, iface, attr);
+       if (!proto)
+               proto = &no_proto;
 
+       state = proto->attach(proto, iface, attr);
        if (!state) {
                state = no_proto.attach(&no_proto, iface, attr);
                state->cb = invalid_proto_handler;
@@ -183,8 +184,10 @@ proto_attach_interface(struct interface *iface, const char *proto_name)
        }
 
        proto = get_proto_handler(proto_name);
-       if (!proto)
+       if (!proto) {
                interface_add_error(iface, "proto", "INVALID_PROTO", NULL, 0);
+               proto = &no_proto;
+       }
 
        iface->proto_handler = proto;
 }