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VFIO fixes for v5.8-rc7

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- Fix race with eventfd ctx cleared outside of mutex (Zeng Tao)
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Merge tag 'vfio-v5.8-rc7' of git://github.com/awilliam/linux-vfio into master

Pull VFIO fix from Alex Williamson:
 "Fix race with eventfd ctx cleared outside of mutex (Zeng Tao)"

* tag 'vfio-v5.8-rc7' of git://github.com/awilliam/linux-vfio:
  vfio/pci: fix racy on error and request eventfd ctx
This commit is contained in:
Linus Torvalds 2020-07-20 13:30:59 -07:00
commit 4fa640dc52
1 changed files with 5 additions and 0 deletions
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5
drivers/vfio/pci/vfio_pci.c
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@ -521,14 +521,19 @@ static void vfio_pci_release(void *device_data)
vfio_pci_vf_token_user_add(vdev, -1);
vfio_spapr_pci_eeh_release(vdev->pdev);
vfio_pci_disable(vdev);
mutex_lock(&vdev->igate);
if (vdev->err_trigger) {
eventfd_ctx_put(vdev->err_trigger);
vdev->err_trigger = NULL;
}
mutex_unlock(&vdev->igate);
mutex_lock(&vdev->igate);
if (vdev->req_trigger) {
eventfd_ctx_put(vdev->req_trigger);
vdev->req_trigger = NULL;
}
mutex_unlock(&vdev->igate);
}
mutex_unlock(&vdev->reflck->lock);