This is a note to let you know that I've just added the patch titled
virtio-scsi: Fix hotcpu_notifier use-after-free with virtscsi_freeze
to the 3.13-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
virtio-scsi-fix-hotcpu_notifier-use-after-free-with-virtscsi_freeze.patch
and it can be found in the queue-3.13 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From f466f75385369a181409e46da272db3de6f5c5cb Mon Sep 17 00:00:00 2001
From: Asias He <asias.hejun@xxxxxxxxx>
Date: Thu, 16 Jan 2014 10:18:48 +1030
Subject: virtio-scsi: Fix hotcpu_notifier use-after-free with virtscsi_freeze
From: Asias He <asias.hejun@xxxxxxxxx>
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@xxxxxxxxx>
Reviewed-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Signed-off-by: Jason Wang <jasowang@xxxxxxxxxx>
Signed-off-by: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/scsi/virtio_scsi.c | 15 ++++++++++++++-
1 file changed, 14 insertions(+), 1 deletion(-)
--- a/drivers/scsi/virtio_scsi.c
+++ b/drivers/scsi/virtio_scsi.c
@@ -956,6 +956,10 @@ static void virtscsi_remove(struct virti
#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 virti
{
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
Patches currently in stable-queue which might be from asias.hejun@xxxxxxxxx are
queue-3.13/virtio-scsi-fix-hotcpu_notifier-use-after-free-with-virtscsi_freeze.patch
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