linux-kernel - Re: [PATCHv1 1/7] vfio/mdev: Avoid release parent reference during error path

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Message-ID: <20190401185847.0e45cad7.cohuck@redhat.com>
Date:   Mon, 1 Apr 2019 18:58:47 +0200
From:   Cornelia Huck <cohuck@...hat.com>
To:     Parav Pandit <parav@...lanox.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        kwankhede@...dia.com, alex.williamson@...hat.com, cjia@...dia.com
Subject: Re: [PATCHv1 1/7] vfio/mdev: Avoid release parent reference during
 error path

On Tue, 26 Mar 2019 22:45:39 -0500
Parav Pandit <parav@...lanox.com> wrote:

> During mdev parent registration in mdev_register_device(),
> if parent device is duplicate, it releases the reference of existing
> parent device.
> This is incorrect. Existing parent device should not be touched.
> 
> Fixes: 7b96953bc640 ("vfio: Mediated device Core driver")
> Reviewed By: Kirti Wankhede <kwankhede@...dia.com>

Should probably be changed to the canonical Reviewed-by:.

> Reviewed-by: Maxim Levitsky <mlevitsk@...hat.com>
> Signed-off-by: Parav Pandit <parav@...lanox.com>
> ---
>  drivers/vfio/mdev/mdev_core.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/vfio/mdev/mdev_core.c b/drivers/vfio/mdev/mdev_core.c
> index b96fedc..1299d2e 100644
> --- a/drivers/vfio/mdev/mdev_core.c
> +++ b/drivers/vfio/mdev/mdev_core.c
> @@ -181,6 +181,7 @@ int mdev_register_device(struct device *dev, const struct mdev_parent_ops *ops)
>  	/* Check for duplicate */
>  	parent = __find_parent_device(dev);
>  	if (parent) {
> +		parent = NULL;
>  		ret = -EEXIST;
>  		goto add_dev_err;
>  	}

Reviewed-by: Cornelia Huck <cohuck@...hat.com>