Messages in this thread | | | Subject | Re: [PATCH v8 1/5] iommu/arm-smmu: Destroy domain context in failure path | From | Robin Murphy <> | Date | Wed, 7 Mar 2018 12:20:45 +0000 |
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On 02/03/18 10:10, Vivek Gautam wrote: > If we fail after initializing domain_context, we should destroy > the context to free up resources.
Have another think about why the "problem" this patch caters for cannot ever happen (hint: consider how domain->smmu is used in arm_smmu_init_domain_context()). And then also about the really catastrophically bad problem it actually introduces (hint: "iommu_attach(domain, good_dev); iommu_attach(domain, bad_dev);")
Robin.
> Signed-off-by: Vivek Gautam <vivek.gautam@codeaurora.org> > --- > > * New patch added in this series. > > drivers/iommu/arm-smmu.c | 7 ++++++- > 1 file changed, 6 insertions(+), 1 deletion(-) > > diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c > index 69e7c60792a8..ffc152c36002 100644 > --- a/drivers/iommu/arm-smmu.c > +++ b/drivers/iommu/arm-smmu.c > @@ -1223,11 +1223,16 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev) > dev_err(dev, > "cannot attach to SMMU %s whilst already attached to domain on SMMU %s\n", > dev_name(smmu_domain->smmu->dev), dev_name(smmu->dev)); > - return -EINVAL; > + ret = -EINVAL; > + goto destroy_domain; > } > > /* Looks ok, so add the device to the domain */ > return arm_smmu_domain_add_master(smmu_domain, fwspec); > + > +destroy_domain: > + arm_smmu_destroy_domain_context(domain); > + return ret; > } > > static int arm_smmu_map(struct iommu_domain *domain, unsigned long iova, >
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