linux-kernel - Re: [PATCH][next] nvdimm/region: Use struct

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Date:   Fri, 19 Jun 2020 14:36:24 -0700
From:   Ira Weiny <ira.weiny@...el.com>
To:     "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc:     Dan Williams <dan.j.williams@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Dave Jiang <dave.jiang@...el.com>, linux-nvdimm@...ts.01.org,
        linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Subject: Re: [PATCH][next] nvdimm/region: Use struct_size() in kzalloc()

On Fri, Jun 19, 2020 at 12:21:12PM -0500, Gustavo A. R. Silva wrote:
> Make use of the struct_size() helper instead of an open-coded version
> in order to avoid any potential type mistakes.
> 
> This issue was found with the help of Coccinelle and, audited and fixed
> manually.
> 
> Addresses-KSPP-ID: https://github.com/KSPP/linux/issues/83
> Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>

Reviewed-by: Ira Weiny <ira.weiny@...el.com>

> ---
>  drivers/nvdimm/region_devs.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c
> index 4502f9c4708d..8365fb1a9114 100644
> --- a/drivers/nvdimm/region_devs.c
> +++ b/drivers/nvdimm/region_devs.c
> @@ -1063,8 +1063,7 @@ static struct nd_region *nd_region_create(struct nvdimm_bus *nvdimm_bus,
>  		struct nd_blk_region *ndbr;
>  
>  		ndbr_desc = to_blk_region_desc(ndr_desc);
> -		ndbr = kzalloc(sizeof(*ndbr) + sizeof(struct nd_mapping)
> -				* ndr_desc->num_mappings,
> +		ndbr = kzalloc(struct_size(ndbr, nd_region.mapping, ndr_desc->num_mappings),
>  				GFP_KERNEL);
>  		if (ndbr) {
>  			nd_region = &ndbr->nd_region;
> -- 
> 2.27.0
>