linux-kernel - Re: [PATCH 2/2][next] vfio/ccw: Use struct

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Message-ID: <46a965e53acef4497d2f0da24267f484daf29e1c.camel@linux.ibm.com>
Date:   Tue, 23 May 2023 12:33:58 -0400
From:   Eric Farman <farman@...ux.ibm.com>
To:     "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Matthew Rosato <mjrosato@...ux.ibm.com>,
        Halil Pasic <pasic@...ux.ibm.com>,
        Vineeth Vijayan <vneethv@...ux.ibm.com>,
        Peter Oberparleiter <oberpar@...ux.ibm.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>
Cc:     linux-s390@...r.kernel.org, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH 2/2][next] vfio/ccw: Use struct_size() helper

On Mon, 2023-05-22 at 19:35 -0600, Gustavo A. R. Silva wrote:
> Prefer struct_size() over open-coded versions.
> 
> Link: https://github.com/KSPP/linux/issues/160
> Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>

Reviewed-by: Eric Farman <farman@...ux.ibm.com>

> ---
>  drivers/s390/cio/vfio_ccw_drv.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/s390/cio/vfio_ccw_drv.c
> b/drivers/s390/cio/vfio_ccw_drv.c
> index 57906a9c6324..43601816ea4e 100644
> --- a/drivers/s390/cio/vfio_ccw_drv.c
> +++ b/drivers/s390/cio/vfio_ccw_drv.c
> @@ -171,8 +171,7 @@ static int vfio_ccw_sch_probe(struct subchannel
> *sch)
>                 return -ENODEV;
>         }
>  
> -       parent = kzalloc(sizeof(*parent) + sizeof(struct mdev_type
> *),
> -                        GFP_KERNEL);
> +       parent = kzalloc(struct_size(parent, mdev_types, 1),
> GFP_KERNEL);
>         if (!parent)
>                 return -ENOMEM;
>