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vfio/pci: Clear error and request eventfd ctx after releasing

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[ Upstream commit 5c5866c593bbd444d0339ede6a8fb5f14ff66d72 ]

The next use of the device will generate an underflow from the
stale reference.

Cc: Qian Cai <cai@lca.pw>
Fixes: 1518ac272e78 ("vfio/pci: fix memory leaks of eventfd ctx")
Reported-by: Daniel Wagner <dwagner@suse.de>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Tested-by: Daniel Wagner <dwagner@suse.de>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Alex Williamson 2020-06-16 15:26:36 -06:00 committed by Greg Kroah-Hartman
parent 590bcc21e1
commit f71d82a6ab
1 changed files with 6 additions and 2 deletions
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8
drivers/vfio/pci/vfio_pci.c
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@ -392,10 +392,14 @@ static void vfio_pci_release(void *device_data)
if (!(--vdev->refcnt)) {
vfio_spapr_pci_eeh_release(vdev->pdev);
vfio_pci_disable(vdev);
if (vdev->err_trigger)
if (vdev->err_trigger) {
eventfd_ctx_put(vdev->err_trigger);
if (vdev->req_trigger)
vdev->err_trigger = NULL;
}
if (vdev->req_trigger) {
eventfd_ctx_put(vdev->req_trigger);
vdev->req_trigger = NULL;
}
}
mutex_unlock(&driver_lock);