linux-kernel - Re: [PATCH] s390: crypto: Return -EFAULT if copy_to

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Message-ID: <ffe84ace-92db-c7f5-7e66-fe3172484ec6@linux.ibm.com>
Date:   Mon, 1 Mar 2021 07:18:20 -0500
From:   Tony Krowiak <akrowiak@...ux.ibm.com>
To:     Wang Qing <wangqing@...o.com>, Pierre Morel <pmorel@...ux.ibm.com>,
        Halil Pasic <pasic@...ux.ibm.com>,
        Harald Freudenberger <freude@...ux.ibm.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] s390: crypto: Return -EFAULT if copy_to_user() fails



On 3/1/21 7:08 AM, Wang Qing wrote:
> The copy_to_user() function returns the number of bytes remaining to be
> copied, but we want to return -EFAULT if the copy doesn't complete.
>
> Signed-off-by: Wang Qing <wangqing@...o.com>
> ---
>   drivers/s390/crypto/vfio_ap_ops.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c
> index 41fc2e413..1ffdd41
> --- a/drivers/s390/crypto/vfio_ap_ops.c
> +++ b/drivers/s390/crypto/vfio_ap_ops.c
> @@ -1286,7 +1286,7 @@ static int vfio_ap_mdev_get_device_info(unsigned long arg)
>   	info.num_regions = 0;
>   	info.num_irqs = 0;
>   
> -	return copy_to_user((void __user *)arg, &info, minsz);
> +	return copy_to_user((void __user *)arg, &info, minsz) ? -EFAULT : 0;
>   }

LGTM
Reviewed-by: Tony Krowiak <akrowiak@...ux.ibm.com>

>   
>   static ssize_t vfio_ap_mdev_ioctl(struct mdev_device *mdev,