libubus: Check if remove callback exists before call it

When process unsubscribes then remove callback is called. But it
can be NULL if not defined, so we should check it before we call it.

Signed-off-by: Lukasz Baj <l.baj@radytek.com>

diff --git a/libubus-obj.c b/libubus-obj.c
index ed18ca99f4ecff13bd0f16e82c859d870d580e66..bdb2e03478d70541691448ff7e2b672e0711871e 100644 (file)
--- a/libubus-obj.c
+++ b/libubus-obj.c
@@ -27,7 +27,8 @@ ubus_process_unsubscribe(struct ubus_context *ctx, struct ubus_msghdr *hdr,
                return;
 
        s = container_of(obj, struct ubus_subscriber, obj);
-       s->remove_cb(ctx, s, blob_get_u32(attrbuf[UBUS_ATTR_TARGET]));
+       if (s->remove_cb)
+               s->remove_cb(ctx, s, blob_get_u32(attrbuf[UBUS_ATTR_TARGET]));
 }
 
 static void