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Commit 6f3180af authored by Jason Wang's avatar Jason Wang Committed by David S. Miller
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vhost: do not try to access device IOTLB when not initialized 



The code will try to access dev->iotlb when processing
VHOST_IOTLB_INVALIDATE even if it was not initialized which may lead
to NULL pointer dereference. Fixes this by check dev->iotlb before.

Fixes: 6b1e6cc7 ("vhost: new device IOTLB API")
Signed-off-by: default avatarJason Wang <jasowang@redhat.com>
Acked-by: default avatarMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent e9cb4239

drivers/vhost/vhost.c

+4 −0
Original line number Diff line number Diff line
@@ -1015,6 +1015,10 @@ static 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_vq_meta_reset(dev);

		vhost_del_umem_range(dev->iotlb, msg->iova,

				     msg->iova + msg->size - 1);