From 2bf4fd31394a3f875ea093ee8a209f30b378cbf3 Mon Sep 17 00:00:00 2001 From: Heinz Graalfs Date: Mon, 11 Nov 2013 11:52:43 +1030 Subject: virtio_scsi: verify if queue is broken after virtqueue_get_buf() If virtqueue_get_buf() returned with a NULL pointer avoid a possibly endless loop by checking for a broken virtqueue. Signed-off-by: Heinz Graalfs Signed-off-by: Rusty Russell --- drivers/scsi/virtio_scsi.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'drivers/scsi') diff --git a/drivers/scsi/virtio_scsi.c b/drivers/scsi/virtio_scsi.c index e6bb2352df40..c3173dced870 100644 --- a/drivers/scsi/virtio_scsi.c +++ b/drivers/scsi/virtio_scsi.c @@ -224,6 +224,9 @@ static void virtscsi_vq_done(struct virtio_scsi *vscsi, virtqueue_disable_cb(vq); while ((buf = virtqueue_get_buf(vq, &len)) != NULL) fn(vscsi, buf); + + if (unlikely(virtqueue_is_broken(vq))) + break; } while (!virtqueue_enable_cb(vq)); spin_unlock_irqrestore(&virtscsi_vq->vq_lock, flags); } -- cgit v1.2.3