When IOTLB is not enabled, we should forbid IOTLB invalidation to
avoid a NULL pointer dereference.
Signed-off-by: Jason Wang <jasowang@xxxxxxxxxx>
---
drivers/vhost/vhost.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index c6f2d89..7d338d5 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -959,6 +959,10 @@ int vhost_process_iotlb_msg(struct vhost_dev *dev,
vhost_iotlb_notify_vq(dev, msg);
break;
case VHOST_IOTLB_INVALIDATE:
+ if (!dev->iotlb) {
+ ret = -EFAULT;
+ break;
+ }
vhost_del_umem_range(dev->iotlb, msg->iova,
msg->iova + msg->size - 1);
break;
--
2.7.4
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