Re: [PATCH] hw/nvme: fix narrowing conversion

[Klaus Jensen]

On Apr 12 11:59, Dmitry Tikhov wrote:
> Since nlbas is of type int, it does not work with large namespace size
> values, e.g., 9 TB size of file backing namespace and 8 byte metadata
> with 4096 bytes lbasz gives negative nlbas value, which is later
> promoted to negative int64_t type value and results in negative
> ns->moff which breaks namespace
> 
> Signed-off-by: Dmitry Tikhov <ddtikhov@gmail.com>
> ---
>  hw/nvme/ns.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/hw/nvme/ns.c b/hw/nvme/ns.c
> index 324f53ea0c..af6504fad2 100644
> --- a/hw/nvme/ns.c
> +++ b/hw/nvme/ns.c
> @@ -29,7 +29,8 @@ void nvme_ns_init_format(NvmeNamespace *ns)
>  {
>      NvmeIdNs *id_ns = &ns->id_ns;
>      BlockDriverInfo bdi;
> -    int npdg, nlbas, ret;
> +    int npdg, ret;
> +    int64_t nlbas;
>  
>      ns->lbaf = id_ns->lbaf[NVME_ID_NS_FLBAS_INDEX(id_ns->flbas)];
>      ns->lbasz = 1 << ns->lbaf.ds;
> @@ -42,7 +43,7 @@ void nvme_ns_init_format(NvmeNamespace *ns)
>      id_ns->ncap = id_ns->nsze;
>      id_ns->nuse = id_ns->ncap;
>  
> -    ns->moff = (int64_t)nlbas << ns->lbaf.ds;
> +    ns->moff = nlbas << ns->lbaf.ds;
>  
>      npdg = ns->blkconf.discard_granularity / ns->lbasz;
>  
> -- 
> 2.35.1
> 

Thanks Dmitry. Looks reasonable,

Reviewed-by: Klaus Jensen <k.jensen@samsung.com>

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