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authorHeinz Graalfs <graalfs@linux.vnet.ibm.com>2013-11-11 05:22:43 +0400
committerRusty Russell <rusty@rustcorp.com.au>2013-11-11 05:23:26 +0400
commit2bf4fd31394a3f875ea093ee8a209f30b378cbf3 (patch)
tree4889f6272a152930d7cc72c2a30c88d55f57ba39 /drivers/scsi/virtio_scsi.c
parentcdd77e87eae52b7251acc5990207a1c4500a84ce (diff)
downloadlinux-2bf4fd31394a3f875ea093ee8a209f30b378cbf3.tar.xz
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 <graalfs@linux.vnet.ibm.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'drivers/scsi/virtio_scsi.c')
-rw-r--r--drivers/scsi/virtio_scsi.c3
1 files changed, 3 insertions, 0 deletions
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);
}