vhost: check owner before we overwrite ubuf_info
If device has an owner, we shouldn't touch ubuf_info
since it might be in use.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
index b07d96b..8cf5aec 100644
--- a/drivers/vhost/net.c
+++ b/drivers/vhost/net.c
@@ -1054,6 +1054,10 @@
int r;
mutex_lock(&n->dev.mutex);
+ if (vhost_dev_has_owner(&n->dev)) {
+ r = -EBUSY;
+ goto out;
+ }
r = vhost_net_set_ubuf_info(n);
if (r)
goto out;
