[PATCH 6.12 359/567] iommu/mediatek-v1: fix device leak on probe_device()

Greg Kroah-Hartman
2026-01-06T17:34:03Z

From: Johan Hovold <johan@kernel.org>

commit c77ad28bfee0df9cbc719eb5adc9864462cfb65b upstream.

Make sure to drop the reference taken to the iommu platform device when
looking up its driver data during probe_device().

Fixes: b17336c55d89 ("iommu/mediatek: add support for mtk iommu generation one HW")
Cc: stable@vger.kernel.org # 4.8
Cc: Honghui Zhang <honghui.zhang@mediatek.com>
Acked-by: Robin Murphy <robin.murphy@arm.com>
Reviewed-by: Yong Wu <yong.wu@mediatek.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/iommu/mtk_iommu_v1.c | 2 ++
1 file changed, 2 insertions(+)

--- a/drivers/iommu/mtk_iommu_v1.c
+++ b/drivers/iommu/mtk_iommu_v1.c
@@ -423,6 +423,8 @@ static int mtk_iommu_v1_create_mapping(s
return -EINVAL;

dev_iommu_priv_set(dev, platform_get_drvdata(m4updev));
+
+ put_device(&m4updev->dev);
}

ret = iommu_fwspec_add_ids(dev, args->args, 1);