virtio-scsi: Fix hotcpu_notifier use-after-free with virtscsi_freeze

vqs are freed in virtscsi_freeze but the hotcpu_notifier is not
unregistered. We will have a use-after-free usage when the notifier
callback is called after virtscsi_freeze.

Fixes: 285e71ea6f3583a85e27cb2b9a7d8c35d4c0d558
("virtio-scsi: reset virtqueue affinity when doing cpu hotplug")

Cc: stable@vger.kernel.org
Signed-off-by: Asias He <asias.hejun@gmail.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

diff --git a/drivers/scsi/virtio_scsi.c b/drivers/scsi/virtio_scsi.c
index c3173dced87038f41b00d918d1f114ceaac09208..16bfd50cd3fe65644c5443698d3aa3e96dfd5925 100644 (file)
--- a/drivers/scsi/virtio_scsi.c
+++ b/drivers/scsi/virtio_scsi.c
@@ -956,6 +956,10 @@ static void virtscsi_remove(struct virtio_device *vdev)
 #ifdef CONFIG_PM_SLEEP
 static int virtscsi_freeze(struct virtio_device *vdev)
 {
+       struct Scsi_Host *sh = virtio_scsi_host(vdev);
+       struct virtio_scsi *vscsi = shost_priv(sh);
+
+       unregister_hotcpu_notifier(&vscsi->nb);
        virtscsi_remove_vqs(vdev);
        return 0;
 }
@@ -964,8 +968,17 @@ static int virtscsi_restore(struct virtio_device *vdev)
 {
        struct Scsi_Host *sh = virtio_scsi_host(vdev);
        struct virtio_scsi *vscsi = shost_priv(sh);
+       int err;
+
+       err = virtscsi_init(vdev, vscsi);
+       if (err)
+               return err;
+
+       err = register_hotcpu_notifier(&vscsi->nb);
+       if (err)
+               vdev->config->del_vqs(vdev);
 
-       return virtscsi_init(vdev, vscsi);
+       return err;
 }
 #endif