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Date: Mon, 20 Aug 2018 21:16:40 +0000 From: kys@...uxonhyperv.com To: gregkh@...uxfoundation.org, 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, vkuznets@...hat.com Cc: Stephen Hemminger <stephen@...workplumber.org>, "K . Y . Srinivasan" <kys@...rosoft.com>, stable@...r.kernel.org Subject: [PATCH] vmbus: don't return values for uninitalized channels 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 --- 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); } -- 2.18.0
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