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Message-ID: <ZBGMqfPQiR84NkMQ@nimitz>
Date: Wed, 15 Mar 2023 10:15:21 +0100
From: Piotr Raczynski <piotr.raczynski@...el.com>
To: Liang He <windhl@....com>
CC: <davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
<pabeni@...hat.com>, <netdev@...r.kernel.org>
Subject: Re: [PATCH] ethernet: sun: add check for the mdesc_grab()
On Wed, Mar 15, 2023 at 02:00:21PM +0800, Liang He wrote:
> In vnet_port_probe() and vsw_port_probe(), we should
> check the return value of mdesc_grab() as it may
> return NULL which can caused NPD bugs.
>
> Fixes: 5d01fa0c6bd8 ("ldmvsw: Add ldmvsw.c driver code")
> Fixes: 43fdf27470b2 ("[SPARC64]: Abstract out mdesc accesses for better MD update handling.")
> Signed-off-by: Liang He <windhl@....com>
> ---
> drivers/net/ethernet/sun/ldmvsw.c | 3 +++
> drivers/net/ethernet/sun/sunvnet.c | 3 +++
> 2 files changed, 6 insertions(+)
>
> diff --git a/drivers/net/ethernet/sun/ldmvsw.c b/drivers/net/ethernet/sun/ldmvsw.c
> index 8addee6d04bd..734a817d3c94 100644
> --- a/drivers/net/ethernet/sun/ldmvsw.c
> +++ b/drivers/net/ethernet/sun/ldmvsw.c
> @@ -287,6 +287,9 @@ static int vsw_port_probe(struct vio_dev *vdev, const struct vio_device_id *id)
>
> hp = mdesc_grab();
>
> + if (!hp)
> + return -ENODEV;
> +
> rmac = mdesc_get_property(hp, vdev->mp, remote_macaddr_prop, &len);
> err = -ENODEV;
> if (!rmac) {
> diff --git a/drivers/net/ethernet/sun/sunvnet.c b/drivers/net/ethernet/sun/sunvnet.c
> index fe86fbd58586..e220620d0ffc 100644
> --- a/drivers/net/ethernet/sun/sunvnet.c
> +++ b/drivers/net/ethernet/sun/sunvnet.c
> @@ -433,6 +433,9 @@ static int vnet_port_probe(struct vio_dev *vdev, const struct vio_device_id *id)
>
> hp = mdesc_grab();
>
> + if (!hp)
> + return -ENODEV;
> +
> vp = vnet_find_parent(hp, vdev->mp, vdev);
> if (IS_ERR(vp)) {
> pr_err("Cannot find port parent vnet\n");
> --
> 2.25.1
>
Perfectly valid checks, thanks.
Reviewed-by: Piotr Raczynski <piotr.raczynski@...el.com>
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