linux-hardening - Re: [PATCH 1/2][next] vfio/ccw: Replace one-element array with flexible-array member

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Date:   Tue, 23 May 2023 12:33:54 -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 1/2][next] vfio/ccw: Replace one-element array with
 flexible-array member

On Mon, 2023-05-22 at 19:35 -0600, Gustavo A. R. Silva wrote:
> One-element arrays are deprecated, and we are replacing them with
> flexible
> array members instead. So, replace one-element array with flexible-
> array
> member in struct vfio_ccw_parent and refactor the the rest of the

s/the the/the/

> code
> accordingly.
> 
> Link: https://github.com/KSPP/linux/issues/79
> Link: https://github.com/KSPP/linux/issues/297
> 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 ++-
>  drivers/s390/cio/vfio_ccw_private.h | 2 +-
>  2 files changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/s390/cio/vfio_ccw_drv.c
> b/drivers/s390/cio/vfio_ccw_drv.c
> index ff538a086fc7..57906a9c6324 100644
> --- a/drivers/s390/cio/vfio_ccw_drv.c
> +++ b/drivers/s390/cio/vfio_ccw_drv.c
> @@ -171,7 +171,8 @@ static int vfio_ccw_sch_probe(struct subchannel
> *sch)
>                 return -ENODEV;
>         }
>  
> -       parent = kzalloc(sizeof(*parent), GFP_KERNEL);
> +       parent = kzalloc(sizeof(*parent) + sizeof(struct mdev_type
> *),
> +                        GFP_KERNEL);
>         if (!parent)
>                 return -ENOMEM;
>  
> diff --git a/drivers/s390/cio/vfio_ccw_private.h
> b/drivers/s390/cio/vfio_ccw_private.h
> index b441ae6700fd..b62bbc5c6376 100644
> --- a/drivers/s390/cio/vfio_ccw_private.h
> +++ b/drivers/s390/cio/vfio_ccw_private.h
> @@ -79,7 +79,7 @@ struct vfio_ccw_parent {
>  
>         struct mdev_parent      parent;
>         struct mdev_type        mdev_type;
> -       struct mdev_type        *mdev_types[1];
> +       struct mdev_type        *mdev_types[];
>  };
>  
>  /**