diff options
| author | Stephen Hemminger <stephen@networkplumber.org> | 2018-08-20 23:16:40 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-09-12 09:31:00 +0200 |
| commit | 6712cc9c22117a8af9f3df272b4a44fd2e4201cd (patch) | |
| tree | a611d54ecc7834995fc5f3371d8ccdb1ba652a79 /drivers | |
| parent | fpga: dfl: fme: fix return value check in in pr_mgmt_init() (diff) | |
| download | linux-6712cc9c22117a8af9f3df272b4a44fd2e4201cd.tar.xz linux-6712cc9c22117a8af9f3df272b4a44fd2e4201cd.zip | |
vmbus: don't return values for uninitalized channels
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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/hv/vmbus_drv.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c index b1b548a21f91..c71cc857b649 100644 --- a/drivers/hv/vmbus_drv.c +++ b/drivers/hv/vmbus_drv.c @@ -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); } |