On Mon, Apr 09, 2018 at 09:10:21PM +0800, Stefan Hajnoczi wrote: > Commit d65026c6c62e7d9616c8ceb5a53b68bcdc050525 ("vhost: validate log > when IOTLB is enabled") introduced a regression. The logic was > originally: > > if (vq->iotlb) > return 1; > return A && B; > > After the patch the short-circuit logic for A was inverted: > > if (A || vq->iotlb) > return A; > return B; > > The correct logic is: > > if (!A || vq->iotlb) > return A; > return B; > > Reported-by: syzbot+65a84dde0214b0387ccd@xxxxxxxxxxxxxxxxxxxxxxxxx > Cc: Jason Wang <jasowang@xxxxxxxxxx> > Signed-off-by: Stefan Hajnoczi <stefanha@xxxxxxxxxx> Acked-by: Michael S. Tsirkin <mst@xxxxxxxxxx> > --- > drivers/vhost/vhost.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c > index 5320039671b7..f6af4210679a 100644 > --- a/drivers/vhost/vhost.c > +++ b/drivers/vhost/vhost.c > @@ -1246,7 +1246,7 @@ int vhost_vq_access_ok(struct vhost_virtqueue *vq) > { > int ret = vq_log_access_ok(vq, vq->log_base); > > - if (ret || vq->iotlb) > + if (!ret || vq->iotlb) > return ret; > > return vq_access_ok(vq, vq->num, vq->desc, vq->avail, vq->used); > -- > 2.14.3 _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/virtualization