[PATCH] nvmet-passthru: Cleanup nvmet_passthru_map_sg()

[Christoph Hellwig]

On Fri, Oct 09, 2020 at 05:18:16PM -0600, Logan Gunthorpe wrote:
>  static int nvmet_passthru_map_sg(struct nvmet_req *req, struct request *rq)
>  {
> -	int sg_cnt = req->sg_cnt;
>  	struct scatterlist *sg;
>  	int op_flags = 0;
>  	struct bio *bio;
>  	int i, ret;
>  
> +	if (req->sg_cnt > BIO_MAX_PAGES)
> +		return -EINVAL;

Don't you need to handle larger requests as well?  Or at least
limit MDTS?