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vmbus: don't return values for uninitalized channels

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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: c2e5df616e ("vmbus: add per-channel sysfs info")

Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Cc: <stable@vger.kernel.org> # 4.15
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Stephen Hemminger 2018-08-20 21:16:40 +00:00 committed by Greg Kroah-Hartman
parent 029d727b4f
commit 6712cc9c22
1 changed files with 3 additions and 0 deletions
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3
drivers/hv/vmbus_drv.c
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@ -1291,6 +1291,9 @@ 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);
}