RE: [EXT] [PATCH 1/2] crypto: caam - Use struct_size()

[Gaurav Jain]

Reviewed-by: Gaurav Jain <gaurav.jain@xxxxxxx>

> -----Original Message-----
> From: Christophe JAILLET <christophe.jaillet@xxxxxxxxxx>
> Sent: Saturday, July 22, 2023 8:24 PM
> To: Horia Geanta <horia.geanta@xxxxxxx>; Pankaj Gupta
> <pankaj.gupta@xxxxxxx>; Gaurav Jain <gaurav.jain@xxxxxxx>; Herbert Xu
> <herbert@xxxxxxxxxxxxxxxxxxx>; David S. Miller <davem@xxxxxxxxxxxxx>
> Cc: linux-kernel@xxxxxxxxxxxxxxx; kernel-janitors@xxxxxxxxxxxxxxx; Christophe
> JAILLET <christophe.jaillet@xxxxxxxxxx>; linux-crypto@xxxxxxxxxxxxxxx
> Subject: [EXT] [PATCH 1/2] crypto: caam - Use struct_size()
> 
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> 
> 
> Use struct_size() instead of hand-writing it, when allocating a structure with a
> flex array.
> 
> This is less verbose, more robust and more informative.
> 
> Signed-off-by: Christophe JAILLET <christophe.jaillet@xxxxxxxxxx>
> ---
>  drivers/crypto/caam/caamhash.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/crypto/caam/caamhash.c b/drivers/crypto/caam/caamhash.c
> index 80deb003f0a5..9e5924e24f2e 100644
> --- a/drivers/crypto/caam/caamhash.c
> +++ b/drivers/crypto/caam/caamhash.c
> @@ -708,9 +708,8 @@ static struct ahash_edesc *ahash_edesc_alloc(struct
> ahash_request *req,
>         gfp_t flags = (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
>                        GFP_KERNEL : GFP_ATOMIC;
>         struct ahash_edesc *edesc;
> -       unsigned int sg_size = sg_num * sizeof(struct sec4_sg_entry);
> 
> -       edesc = kzalloc(sizeof(*edesc) + sg_size, flags);
> +       edesc = kzalloc(struct_size(edesc, sec4_sg, sg_num), flags);
>         if (!edesc) {
>                 dev_err(ctx->jrdev, "could not allocate extended descriptor\n");
>                 return NULL;
> --
> 2.34.1