intel-iommu: Fix oops with intel_iommu=igfx_off
The hotplug notifier will call find_domain() to see if the device in question has been assigned an IOMMU domain. However, this should never be called for devices with a "dummy" domain, such as graphics devices when intel_iommu=igfx_off is set and the corresponding IOMMU isn't even initialised. If you do that, it'll oops as it dereferences the (-1) pointer. The notifier function should check iommu_no_mapping() for the device before doing anything else. Cc: stable@kernel.org Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
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@ -3247,6 +3247,9 @@ static int device_notifier(struct notifier_block *nb,
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struct pci_dev *pdev = to_pci_dev(dev);
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struct dmar_domain *domain;
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if (iommu_no_mapping(dev))
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return 0;
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domain = find_domain(pdev);
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if (!domain)
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return 0;
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