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: 021bb8420d44 ("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>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index 3af7f8f62d0a..d388629ab990 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -1400,7 +1400,7 @@ static int arm_smmu_add_device(struct device *dev)
                 fwspec = dev->iommu_fwspec;
                 if (ret)
                         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));
         } else {
                 return -ENODEV;