libubus: check if subscriber cb is non-NULL before calling it

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

diff --git a/libubus-sub.c b/libubus-sub.c
index 8ffb018..167630c 100644 (file)
--- a/libubus-sub.c
+++ b/libubus-sub.c
@@ -21,7 +21,8 @@ static int ubus_subscriber_cb(struct ubus_context *ctx, struct ubus_object *obj,
        struct ubus_subscriber *s;
 
        s = container_of(obj, struct ubus_subscriber, obj);
        struct ubus_subscriber *s;
 
        s = container_of(obj, struct ubus_subscriber, obj);

-       s->cb(ctx, obj, req, method, msg);
+       if (s->cb)
+               s->cb(ctx, obj, req, method, msg);

        return 0;
 }
 
        return 0;
 }