[PATCH] nvme: fix KASAN warning when parsing host nqn

[Christoph Hellwig]

On Mon, May 14, 2018 at 02:23:12PM +0200, Hannes Reinecke wrote:
> -	host = kmalloc(sizeof(*host), GFP_KERNEL);
> +	host = kzalloc(sizeof(*host), GFP_KERNEL);
>  	if (!host)
>  		goto out_unlock;
>  
>  	kref_init(&host->ref);
> -	memcpy(host->nqn, hostnqn, NVMF_NQN_SIZE);
> +	memcpy(host->nqn, hostnqn, strlen(hostnqn));

That pattern is called strcpy :)  And we better use strlcpy here,
just in case.