static int binder_translate_binder()

in binder.c [2047:2098]

• 48 lines of code
• 7 McCabe index (conditional complexity)

static int binder_translate_binder(struct flat_binder_object *fp,
				   struct binder_transaction *t,
				   struct binder_thread *thread)
{
	struct binder_node *node;
	struct binder_proc *proc = thread->proc;
	struct binder_proc *target_proc = t->to_proc;
	struct binder_ref_data rdata;
	int ret = 0;

	node = binder_get_node(proc, fp->binder);
	if (!node) {
		node = binder_new_node(proc, fp);
		if (!node)
			return -ENOMEM;
	}
	if (fp->cookie != node->cookie) {
		binder_user_error("%d:%d sending u%016llx node %d, cookie mismatch %016llx != %016llx\n",
				  proc->pid, thread->pid, (u64)fp->binder,
				  node->debug_id, (u64)fp->cookie,
				  (u64)node->cookie);
		ret = -EINVAL;
		goto done;
	}
	if (security_binder_transfer_binder(proc->cred, target_proc->cred)) {
		ret = -EPERM;
		goto done;
	}

	ret = binder_inc_ref_for_node(target_proc, node,
			fp->hdr.type == BINDER_TYPE_BINDER,
			&thread->todo, &rdata);
	if (ret)
		goto done;

	if (fp->hdr.type == BINDER_TYPE_BINDER)
		fp->hdr.type = BINDER_TYPE_HANDLE;
	else
		fp->hdr.type = BINDER_TYPE_WEAK_HANDLE;
	fp->binder = 0;
	fp->handle = rdata.desc;
	fp->cookie = 0;

	trace_binder_transaction_node_to_ref(t, node, &rdata);
	binder_debug(BINDER_DEBUG_TRANSACTION,
		     "        node %d u%016llx -> ref %d desc %d\n",
		     node->debug_id, (u64)node->ptr,
		     rdata.debug_id, rdata.desc);
done:
	binder_put_node(node);
	return ret;
}