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| author | Asias He <asias.hejun@gmail.com> | 2014-01-16 10:18:48 +1030 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-02-06 11:22:21 -0800 |
| commit | f2d6b1bada7ce0e72258302dbd365e89b4578986 (patch) | |
| tree | f8c1a27f751d2b8688be8b85c252248d73977ed4 | |
| parent | e88fcbf2e77942ae29ec1fb2c387363b5ac5ef31 (diff) | |
| download | lwn-f2d6b1bada7ce0e72258302dbd365e89b4578986.tar.gz lwn-f2d6b1bada7ce0e72258302dbd365e89b4578986.zip | |
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 |