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iommu: Check dev->iommu in iommu_dev_xxx functions

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[ Upstream commit b9abb19fa5 ]

The device iommu probe/attach might have failed leaving dev->iommu
to NULL and device drivers may still invoke these functions resulting
in a crash in iommu vendor driver code.

Hence make sure we check that.

Fixes: a3a195929d ("iommu: Add APIs for multiple domains per device")
Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Link: https://lore.kernel.org/r/20210303173611.520-1-shameerali.kolothum.thodi@huawei.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Shameer Kolothum 2021-03-03 17:36:11 +00:00 • committed by Greg Kroah-Hartman
commit b60e13c306
1 changed files with 15 additions and 9 deletions
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24
drivers/iommu/iommu.c
View file

@ -2872,10 +2872,12 @@ EXPORT_SYMBOL_GPL(iommu_dev_has_feature);
int iommu_dev_enable_feature(struct device *dev, enum iommu_dev_features feat)
{
const struct iommu_ops *ops = dev->bus->iommu_ops;
if (dev->iommu && dev->iommu->iommu_dev) {
const struct iommu_ops *ops = dev->iommu->iommu_dev->ops;
if (ops && ops->dev_enable_feat)
return ops->dev_enable_feat(dev, feat);
if (ops->dev_enable_feat)
return ops->dev_enable_feat(dev, feat);
}
return -ENODEV;
}
@ -2888,10 +2890,12 @@ EXPORT_SYMBOL_GPL(iommu_dev_enable_feature);
*/
int iommu_dev_disable_feature(struct device *dev, enum iommu_dev_features feat)
{
const struct iommu_ops *ops = dev->bus->iommu_ops;
if (dev->iommu && dev->iommu->iommu_dev) {
const struct iommu_ops *ops = dev->iommu->iommu_dev->ops;
if (ops && ops->dev_disable_feat)
return ops->dev_disable_feat(dev, feat);
if (ops->dev_disable_feat)
return ops->dev_disable_feat(dev, feat);
}
return -EBUSY;
}
@ -2899,10 +2903,12 @@ EXPORT_SYMBOL_GPL(iommu_dev_disable_feature);
bool iommu_dev_feature_enabled(struct device *dev, enum iommu_dev_features feat)
{
const struct iommu_ops *ops = dev->bus->iommu_ops;
if (dev->iommu && dev->iommu->iommu_dev) {
const struct iommu_ops *ops = dev->iommu->iommu_dev->ops;
if (ops && ops->dev_feat_enabled)
return ops->dev_feat_enabled(dev, feat);
if (ops->dev_feat_enabled)
return ops->dev_feat_enabled(dev, feat);
}
return false;
}