static int tee_ioctl_supp_recv()

in tee_core.c [681:730]

• 40 lines of code
• 12 McCabe index (conditional complexity)

static int tee_ioctl_supp_recv(struct tee_context *ctx,
			       struct tee_ioctl_buf_data __user *ubuf)
{
	int rc;
	struct tee_ioctl_buf_data buf;
	struct tee_iocl_supp_recv_arg __user *uarg;
	struct tee_param *params;
	u32 num_params;
	u32 func;

	if (!ctx->teedev->desc->ops->supp_recv)
		return -EINVAL;

	if (copy_from_user(&buf, ubuf, sizeof(buf)))
		return -EFAULT;

	if (buf.buf_len > TEE_MAX_ARG_SIZE ||
	    buf.buf_len < sizeof(struct tee_iocl_supp_recv_arg))
		return -EINVAL;

	uarg = u64_to_user_ptr(buf.buf_ptr);
	if (get_user(num_params, &uarg->num_params))
		return -EFAULT;

	if (sizeof(*uarg) + TEE_IOCTL_PARAM_SIZE(num_params) != buf.buf_len)
		return -EINVAL;

	params = kcalloc(num_params, sizeof(struct tee_param), GFP_KERNEL);
	if (!params)
		return -ENOMEM;

	rc = params_from_user(ctx, params, num_params, uarg->params);
	if (rc)
		goto out;

	rc = ctx->teedev->desc->ops->supp_recv(ctx, &func, &num_params, params);
	if (rc)
		goto out;

	if (put_user(func, &uarg->func) ||
	    put_user(num_params, &uarg->num_params)) {
		rc = -EFAULT;
		goto out;
	}

	rc = params_to_supp(ctx, uarg->params, num_params, params);
out:
	kfree(params);
	return rc;
}