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iommu/core: Make iommu_group_get_for_dev() more robust

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When a non-PCI device is passed to that function it might
pass group == NULL to iommu_group_add_device() which then
dereferences it and cause a crash this way. Fix it by
just returning an error for non-PCI devices.

Fixes: 104a1c13ac
Cc: Alex Williamson <alex.williamson@redhat.com>
Acked-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Joerg Roedel 2014-08-21 22:32:08 +02:00
parent 52addcf9d6
commit c4a783b89e
1 changed files with 5 additions and 3 deletions
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8
drivers/iommu/iommu.c
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@ -678,15 +678,17 @@ static struct iommu_group *iommu_group_get_for_pci_dev(struct pci_dev *pdev)
*/
struct iommu_group *iommu_group_get_for_dev(struct device *dev)
{
struct iommu_group *group = ERR_PTR(-EIO);
struct iommu_group *group;
int ret;
group = iommu_group_get(dev);
if (group)
return group;
if (dev_is_pci(dev))
group = iommu_group_get_for_pci_dev(to_pci_dev(dev));
if (!dev_is_pci(dev))
return ERR_PTR(-EINVAL);
group = iommu_group_get_for_pci_dev(to_pci_dev(dev));
if (IS_ERR(group))
return group;