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authorWill Deacon <will.deacon@arm.com>2014-07-04 14:06:01 +0400
committerWill Deacon <will.deacon@arm.com>2014-07-04 16:16:05 +0400
commitd3bca16635ae7443139c4408def7c1a50755083f (patch)
treee88a4f7b1fca963cd350631aeb447694cc7b49fb /drivers/iommu/arm-smmu.c
parent9c5c92e35cf5c4f7ee523d62a6bf9d5dc290350b (diff)
downloadlinux-d3bca16635ae7443139c4408def7c1a50755083f.tar.xz
iommu/arm-smmu: fix capability checking prior to device attach
If somebody attempts to check the capability of an IOMMU domain prior to device attach, then we'll try to dereference a NULL SMMU pointer through the SMMU domain (since we can't determine the actual SMMU instance until we have a device attached). This patch fixes the capability check so that non-global features are reported as being absent when no device is attached to the domain. Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'drivers/iommu/arm-smmu.c')
-rw-r--r--drivers/iommu/arm-smmu.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index 7638b579e08d..5496de58fc3b 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -1509,7 +1509,8 @@ static int arm_smmu_domain_has_cap(struct iommu_domain *domain,
unsigned long cap)
{
struct arm_smmu_domain *smmu_domain = domain->priv;
- u32 features = smmu_domain->smmu->features;
+ struct arm_smmu_device *smmu = smmu_domain->smmu;
+ u32 features = smmu ? smmu->features : 0;
switch (cap) {
case IOMMU_CAP_CACHE_COHERENCY: