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iommu/arm-smmu: Check that iommu_fwspecs are ours 

We seem to have forgotten to check that iommu_fwspecs actually belong to
us before we go ahead and dereference their private data. Oops.

Fixes: 021bb8420d ("iommu/arm-smmu: Wire up generic configuration support")
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Robin Murphy 2016-11-02 17:31:32 +00:00 committed by Joerg Roedel
parent ec615f43d3
commit 3c117b5435
1 changed files with 1 additions and 1 deletions
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2
drivers/iommu/arm-smmu.c
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@ -1400,7 +1400,7 @@ static int arm_smmu_add_device(struct device *dev)
fwspec = dev->iommu_fwspec; fwspec = dev->iommu_fwspec;
if (ret) if (ret)
goto out_free; goto out_free;
} else if (fwspec) { } else if (fwspec && fwspec->ops == &arm_smmu_ops) {
smmu = arm_smmu_get_by_node(to_of_node(fwspec->iommu_fwnode)); smmu = arm_smmu_get_by_node(to_of_node(fwspec->iommu_fwnode));
} else { } else {
return -ENODEV; return -ENODEV;