linux-kernel - Re: [PATCH] vmbus: don't return values for uninitalized channels

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Date:   Thu, 30 Aug 2018 13:59:11 +0200
From:   Vitaly Kuznetsov <vkuznets@...hat.com>
To:     gregkh@...uxfoundation.org, kys@...uxonhyperv.com
Cc:     linux-kernel@...r.kernel.org, devel@...uxdriverproject.org,
        olaf@...fle.de, apw@...onical.com, jasowang@...hat.com,
        sthemmin@...rosoft.com, Michael.H.Kelley@...rosoft.com,
        kys@...rosoft.com, stable@...r.kernel.org
Subject: Re: [PATCH] vmbus: don't return values for uninitalized channels

kys@...uxonhyperv.com writes:

> From: Stephen Hemminger <stephen@...workplumber.org>
>
> For unsupported device types, the vmbus channel ringbuffer is never
> initialized, and therefore reading the sysfs files will return garbage
> or cause a kernel OOPS.
>
> Fixes: c2e5df616e1a ("vmbus: add per-channel sysfs info")
>
> Signed-off-by: Stephen Hemminger <sthemmin@...rosoft.com>
> Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
> Cc: <stable@...r.kernel.org> # 4.15

As this is also marked for stable, any chance we can get it in 4.19? Or
at least in char-misc-next?

> ---
>  drivers/hv/vmbus_drv.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
> index e6d8fdac6d8b..4bbc420d1213 100644
> --- a/drivers/hv/vmbus_drv.c
> +++ b/drivers/hv/vmbus_drv.c
> @@ -1368,6 +1368,9 @@ static ssize_t vmbus_chan_attr_show(struct kobject *kobj,
>  	if (!attribute->show)
>  		return -EIO;
>
> +	if (chan->state != CHANNEL_OPENED_STATE)
> +		return -EINVAL;
> +
>  	return attribute->show(chan, buf);
>  }

Thanks,

-- 
  Vitaly