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 05913cc43cb122f9afecdbe775115c058b906e1b 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 1a26044954a6 ("iommu/exynos: add missing put_device() call in exynos_iommu_of_xlate()") fixed the leak in a couple of error paths, but the reference is still leaking on success.
Fixes: aa759fd376fb ("iommu/exynos: Add callback for initializing devices from device tree") Cc: stable@vger.kernel.org # 4.2: 1a26044954a6 Cc: Yu Kuai yukuai3@huawei.com Acked-by: Robin Murphy robin.murphy@arm.com Acked-by: Marek Szyprowski m.szyprowski@samsung.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/exynos-iommu.c | 9 +++------ 1 file changed, 3 insertions(+), 6 deletions(-)
--- a/drivers/iommu/exynos-iommu.c +++ b/drivers/iommu/exynos-iommu.c @@ -1443,17 +1443,14 @@ static int exynos_iommu_of_xlate(struct return -ENODEV;
data = platform_get_drvdata(sysmmu); - if (!data) { - put_device(&sysmmu->dev); + put_device(&sysmmu->dev); + if (!data) return -ENODEV; - }
if (!owner) { owner = kzalloc(sizeof(*owner), GFP_KERNEL); - if (!owner) { - put_device(&sysmmu->dev); + if (!owner) return -ENOMEM; - }
INIT_LIST_HEAD(&owner->controllers); mutex_init(&owner->rpm_lock);