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vfio/pci: Move dummy_resources_list init in vfio_pci_probe()

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[ Upstream commit 16b8fe4caf499ae8e12d2ab1b1324497e36a7b83 ]

In case an error occurs in vfio_pci_enable() before the call to
vfio_pci_probe_mmaps(), vfio_pci_disable() will  try to iterate
on an uninitialized list and cause a kernel panic.

Lets move to the initialization to vfio_pci_probe() to fix the
issue.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Fixes: 05f0c03fbac1 ("vfio-pci: Allow to mmap sub-page MMIO BARs if the mmio page is exclusive")
CC: Stable <stable@vger.kernel.org> # v4.7+
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Eric Auger 2020-11-13 18:52:02 +01:00 committed by Greg Kroah-Hartman
parent aa93e9471a
commit 6e1278ea35
1 changed files with 1 additions and 2 deletions
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3
drivers/vfio/pci/vfio_pci.c
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@ -118,8 +118,6 @@ static void vfio_pci_probe_mmaps(struct vfio_pci_device *vdev)
int bar;
struct vfio_pci_dummy_resource *dummy_res;
INIT_LIST_HEAD(&vdev->dummy_resources_list);
for (bar = PCI_STD_RESOURCES; bar <= PCI_STD_RESOURCE_END; bar++) {
res = vdev->pdev->resource + bar;
@ -1524,6 +1522,7 @@ static int vfio_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
vdev->irq_type = VFIO_PCI_NUM_IRQS;
mutex_init(&vdev->igate);
spin_lock_init(&vdev->irqlock);
INIT_LIST_HEAD(&vdev->dummy_resources_list);
mutex_init(&vdev->vma_lock);
INIT_LIST_HEAD(&vdev->vma_list);
init_rwsem(&vdev->memory_lock);