4.18-stable review patch. If anyone has any objections, please let me know.
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From: Stephen Hemminger stephen@networkplumber.org
commit 6712cc9c22117a8af9f3df272b4a44fd2e4201cd upstream.
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@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
--- drivers/hv/vmbus_drv.c | 3 +++ 1 file changed, 3 insertions(+)
--- a/drivers/hv/vmbus_drv.c +++ b/drivers/hv/vmbus_drv.c @@ -1178,6 +1178,9 @@ static ssize_t vmbus_chan_attr_show(stru if (!attribute->show) return -EIO;
+ if (chan->state != CHANNEL_OPENED_STATE) + return -EINVAL; + return attribute->show(chan, buf); }