Message ID | 1479455920-3285-2-git-send-email-jasowang@redhat.com (mailing list archive) |
---|---|
State | New, archived |
Headers | show |
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;
When IOTLB is not enabled, we should forbid IOTLB invalidation to avoid a NULL pointer dereference. Signed-off-by: Jason Wang <jasowang@redhat.com> --- drivers/vhost/vhost.c | 4 ++++ 1 file changed, 4 insertions(+)