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Code Issues Releases Wiki Activity

vfio/pci: Re-order vfio_pci_probe()

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vfio_add_group_dev() must be called only after all of the private data in
vdev is fully setup and ready, otherwise there could be races with user
space instantiating a device file descriptor and starting to call ops.

For instance vfio_pci_reflck_attach() sets vdev->reflck and
vfio_pci_open(), called by fops open, unconditionally derefs it, which
will crash if things get out of order.

Fixes: cc20d79990 ("vfio/pci: Introduce VF token")
Fixes: e309df5b0c ("vfio/pci: Parallelize device open and release")
Fixes: 6eb7018705 ("vfio-pci: Move idle devices to D3hot power state")
Fixes: ecaa1f6a01 ("vfio-pci: Add VGA arbiter client")
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Max Gurtovoy <mgurtovoy@nvidia.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Message-Id: <8-v3-225de1400dfc+4e074-vfio1_jgg@nvidia.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Jason Gunthorpe 2021-03-30 09:53:06 -06:00 committed by Alex Williamson
parent 61e9081748
commit 4aeec3984d
1 changed files with 9 additions and 8 deletions
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17
drivers/vfio/pci/vfio_pci.c
View file

@ -2030,13 +2030,9 @@ static int vfio_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
INIT_LIST_HEAD(&vdev->vma_list);
init_rwsem(&vdev->memory_lock);
ret = vfio_add_group_dev(&pdev->dev, &vfio_pci_ops, vdev);
if (ret)
goto out_free;
ret = vfio_pci_reflck_attach(vdev);
if (ret)
goto out_del_group_dev;
goto out_free;
ret = vfio_pci_vf_init(vdev);
if (ret)
goto out_reflck;
@ -2060,15 +2056,20 @@ static int vfio_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
vfio_pci_set_power_state(vdev, PCI_D3hot);
}
return ret;
ret = vfio_add_group_dev(&pdev->dev, &vfio_pci_ops, vdev);
if (ret)
goto out_power;
return 0;
out_power:
if (!disable_idle_d3)
vfio_pci_set_power_state(vdev, PCI_D0);
out_vf:
vfio_pci_vf_uninit(vdev);
out_reflck:
vfio_pci_reflck_put(vdev->reflck);
out_del_group_dev:
vfio_del_group_dev(&pdev->dev);
out_free:
kfree(vdev->pm_save);
kfree(vdev);
out_group_put:
vfio_iommu_group_put(group, &pdev->dev);