Use vhost_dev->mutex to protect vhost device iotlb from
concurrent access.
Fixes: 4c8cf318("vhost: introduce vDPA-based backend")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Xie Yongji <xieyongji@xxxxxxxxxxxxx>
Acked-by: Jason Wang <jasowang@xxxxxxxxxx>
Reviewed-by: Stefano Garzarella <sgarzare@xxxxxxxxxx>
---
drivers/vhost/vdpa.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
index 3947fbc2d1d5..63b28d3aee7c 100644
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c
@@ -725,9 +725,11 @@ static int vhost_vdpa_process_iotlb_msg(struct vhost_dev *dev,
const struct vdpa_config_ops *ops = vdpa->config;
int r = 0;
+ mutex_lock(&dev->mutex);
+
r = vhost_dev_check_owner(dev);
if (r)
- return r;
+ goto unlock;
switch (msg->type) {
case VHOST_IOTLB_UPDATE:
@@ -748,6 +750,8 @@ static int vhost_vdpa_process_iotlb_msg(struct vhost_dev *dev,
r = -EINVAL;
break;
}
+unlock:
+ mutex_unlock(&dev->mutex);
return r;
}
--
2.11.0
