diff options
| author | Jason Gunthorpe <jgg@nvidia.com> | 2021-03-30 09:53:06 -0600 |
|---|---|---|
| committer | Alex Williamson <alex.williamson@redhat.com> | 2021-04-06 11:55:10 -0600 |
| commit | 4aeec3984ddc853f7c65903bde472ffdef738bae (patch) | |
| tree | 35f7662ca1a073c9567970bfe04ff0c9109fc850 | |
| parent | 61e90817482871b614133c0f20feb1aba2faec86 (diff) | |
| download | linux-4aeec3984ddc853f7c65903bde472ffdef738bae.tar.bz2 | |
vfio/pci: Re-order vfio_pci_probe()
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: cc20d7999000 ("vfio/pci: Introduce VF token")
Fixes: e309df5b0c9e ("vfio/pci: Parallelize device open and release")
Fixes: 6eb7018705de ("vfio-pci: Move idle devices to D3hot power state")
Fixes: ecaa1f6a0154 ("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>
| -rw-r--r-- | drivers/vfio/pci/vfio_pci.c | 17 |
1 files changed, 9 insertions, 8 deletions
diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c index f95b58376156..0e7682e7a0b4 100644 --- a/drivers/vfio/pci/vfio_pci.c +++ b/drivers/vfio/pci/vfio_pci.c @@ -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); |