6.6-stable review patch. If anyone has any objections, please let me know.
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From: Johan Hovold johan@kernel.org
commit 6a3908ce56e6879920b44ef136252b2f0c954194 upstream.
Make sure to drop the reference taken to the iommu platform device when looking up its driver data during of_xlate().
Note that commit e2eae09939a8 ("iommu/qcom: add missing put_device() call in qcom_iommu_of_xlate()") fixed the leak in a couple of error paths, but the reference is still leaking on success and late failures.
Fixes: 0ae349a0f33f ("iommu/qcom: Add qcom_iommu") Cc: stable@vger.kernel.org # 4.14: e2eae09939a8 Cc: Rob Clark robin.clark@oss.qualcomm.com Cc: Yu Kuai yukuai3@huawei.com Acked-by: Robin Murphy robin.murphy@arm.com Signed-off-by: Johan Hovold johan@kernel.org Signed-off-by: Joerg Roedel joerg.roedel@amd.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/iommu/arm/arm-smmu/qcom_iommu.c | 10 ++++------ 1 file changed, 4 insertions(+), 6 deletions(-)
--- a/drivers/iommu/arm/arm-smmu/qcom_iommu.c +++ b/drivers/iommu/arm/arm-smmu/qcom_iommu.c @@ -539,14 +539,14 @@ static int qcom_iommu_of_xlate(struct de
qcom_iommu = platform_get_drvdata(iommu_pdev);
+ put_device(&iommu_pdev->dev); + /* make sure the asid specified in dt is valid, so we don't have * to sanity check this elsewhere: */ if (WARN_ON(asid > qcom_iommu->max_asid) || - WARN_ON(qcom_iommu->ctxs[asid] == NULL)) { - put_device(&iommu_pdev->dev); + WARN_ON(qcom_iommu->ctxs[asid] == NULL)) return -EINVAL; - }
if (!dev_iommu_priv_get(dev)) { dev_iommu_priv_set(dev, qcom_iommu); @@ -555,10 +555,8 @@ static int qcom_iommu_of_xlate(struct de * multiple different iommu devices. Multiple context * banks are ok, but multiple devices are not: */ - if (WARN_ON(qcom_iommu != dev_iommu_priv_get(dev))) { - put_device(&iommu_pdev->dev); + if (WARN_ON(qcom_iommu != dev_iommu_priv_get(dev))) return -EINVAL; - } }
return iommu_fwspec_add_ids(dev, &asid, 1);