diff options
| author | Asias He <asias.hejun@gmail.com> | 2014-01-16 03:48:48 +0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-02-06 23:08:17 +0400 |
| commit | 26996fcd25dda2f6d34d1888d26585cd519f6af5 (patch) | |
| tree | 3c2a34431e5dc7b523b197f1d13febb29fccadeb | |
| parent | ed9d61e94edf066ba8a2061735899cd97292c002 (diff) | |
| download | linux-26996fcd25dda2f6d34d1888d26585cd519f6af5.tar.xz | |
virtio-scsi: Fix hotcpu_notifier use-after-free with virtscsi_freeze
commit f466f75385369a181409e46da272db3de6f5c5cb upstream.
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")
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/scsi/virtio_scsi.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/drivers/scsi/virtio_scsi.c b/drivers/scsi/virtio_scsi.c index 74b88efde6ad..b26f1a5cc0ec 100644 --- a/drivers/scsi/virtio_scsi.c +++ b/drivers/scsi/virtio_scsi.c @@ -957,6 +957,10 @@ static void virtscsi_remove(struct virtio_device *vdev) #ifdef CONFIG_PM 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; } @@ -965,8 +969,17 @@ 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 |