static int binder_ioctl_get_node_info_for_ref()

in binder.c [4910:4944]

• 28 lines of code
• 9 McCabe index (conditional complexity)

static int binder_ioctl_get_node_info_for_ref(struct binder_proc *proc,
		struct binder_node_info_for_ref *info)
{
	struct binder_node *node;
	struct binder_context *context = proc->context;
	__u32 handle = info->handle;

	if (info->strong_count || info->weak_count || info->reserved1 ||
	    info->reserved2 || info->reserved3) {
		binder_user_error("%d BINDER_GET_NODE_INFO_FOR_REF: only handle may be non-zero.",
				  proc->pid);
		return -EINVAL;
	}

	/* This ioctl may only be used by the context manager */
	mutex_lock(&context->context_mgr_node_lock);
	if (!context->binder_context_mgr_node ||
		context->binder_context_mgr_node->proc != proc) {
		mutex_unlock(&context->context_mgr_node_lock);
		return -EPERM;
	}
	mutex_unlock(&context->context_mgr_node_lock);

	node = binder_get_node_from_ref(proc, handle, true, NULL);
	if (!node)
		return -EINVAL;

	info->strong_count = node->local_strong_refs +
		node->internal_strong_refs;
	info->weak_count = node->local_weak_refs;

	binder_put_node(node);

	return 0;
}