linux-kernel - Re: [PATCH] s390/vfio-ap: Fix memory allocation for mdev

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Date:   Fri, 21 Oct 2022 12:46:49 -0400
From:   Matthew Rosato <mjrosato@...ux.ibm.com>
To:     "Jason J. Herne" <jjherne@...ux.ibm.com>,
        linux-s390@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Christoph Hellwig <hch@...radead.org>
Subject: Re: [PATCH] s390/vfio-ap: Fix memory allocation for mdev_types array

On 10/21/22 10:59 AM, Jason J. Herne wrote:
> The vfio-ap crypto driver fails to allocate memory for an array of
> pointers used to pass supported mdev types to mdev_register_parent().
> 
> Since we only support a single mdev type, the fix is to allocate a
> single entry in the ap_matrix_dev->mdev_types array.
> 
> Fixes: 63e685747784 ("s390: vfio-ap: base implementation of VFIO AP device driver")

I think you want

Fixes: da44c340c4fe ("vfio/mdev: simplify mdev_type handling")

Where *mdev_types[] was introduced.  The fix you propose is the same way Christoph (added to CC) handled vfio-ccw, LGTM.

Reviewed-by: Matthew Rosato <mjrosato@...ux.ibm.com>

> Cc: stable@...r.kernel.org
> Cc: Tony Krowiak <akrowiak@...ux.ibm.com>
> Reported-by: Christian Borntraeger <borntraeger@...ux.ibm.com>
> Signed-off-by: Jason J. Herne <jjherne@...ux.ibm.com>
> ---
>  drivers/s390/crypto/vfio_ap_private.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/s390/crypto/vfio_ap_private.h b/drivers/s390/crypto/vfio_ap_private.h
> index 2eddd5f34ed3..976a65f32e7d 100644
> --- a/drivers/s390/crypto/vfio_ap_private.h
> +++ b/drivers/s390/crypto/vfio_ap_private.h
> @@ -52,7 +52,7 @@ struct ap_matrix_dev {
>  	struct mutex guests_lock; /* serializes access to each KVM guest */
>  	struct mdev_parent parent;
>  	struct mdev_type mdev_type;
> -	struct mdev_type *mdev_types[];
> +	struct mdev_type *mdev_types[1];
>  };
>  
>  extern struct ap_matrix_dev *matrix_dev;