From: Johan Hovold <johan@kernel.org>
Date: Mon, 20 Oct 2025 04:53:09 +0000 (+0200)
Subject: iommu/mediatek: fix device leak on of_xlate()
X-Git-Tag: v6.12.64~207
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=df5b0080583e2ddd324457d286004194d7417df2;p=thirdparty%2Fkernel%2Fstable.git

iommu/mediatek: fix device leak on of_xlate()

commit b3f1ee18280363ef17f82b564fc379ceba9ec86f upstream.

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

Fixes: 0df4fabe208d ("iommu/mediatek: Add mt8173 IOMMU driver")
Cc: stable@vger.kernel.org	# 4.6
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>
---

diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
index 78f83de7e955c..5ebf31f50c06a 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c
@@ -975,6 +975,8 @@ static int mtk_iommu_of_xlate(struct device *dev,
 			return -EINVAL;
 
 		dev_iommu_priv_set(dev, platform_get_drvdata(m4updev));
+
+		put_device(&m4updev->dev);
 	}
 
 	return iommu_fwspec_add_ids(dev, args->args, 1);