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iommu/mediatek: Fix NULL pointer deference in mtk_iommu_device_group

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[ Upstream commit 38e8844005 ]

Currently, mtk_iommu calls during probe iommu_device_register before
the hw_list from driver data is initialized. Since iommu probing issue
fix, it leads to NULL pointer dereference in mtk_iommu_device_group when
hw_list is accessed with list_first_entry (not null safe).

So, change the call order to ensure iommu_device_register is called
after the driver data are initialized.

Fixes: 9e3a2a6436 ("iommu/mediatek: Adapt sharing and non-sharing pgtable case")
Fixes: bcb81ac6ae ("iommu: Get DT/ACPI parsing into the proper probe path")
Reviewed-by: Yong Wu <yong.wu@mediatek.com>
Tested-by: Chen-Yu Tsai <wenst@chromium.org> # MT8183 Juniper, MT8186 Tentacruel
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Tested-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Louis-Alexis Eyraud <louisalexis.eyraud@collabora.com>
Link: https://lore.kernel.org/r/20250403-fix-mtk-iommu-error-v2-1-fe8b18f8b0a8@collabora.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Louis-Alexis Eyraud
2025-04-03 12:22:12 +02:00
committed by Greg Kroah-Hartman
parent 90cdd7e5a4
commit 6abd09bed4
1 changed files with 13 additions and 13 deletions
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drivers/iommu/mtk_iommu.c
+13 -13
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@@ -1354,15 +1354,6 @@ static int mtk_iommu_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, data);
mutex_init(&data->mutex);
ret = iommu_device_sysfs_add(&data->iommu, dev, NULL,
"mtk-iommu.%pa", &ioaddr);
if (ret)
goto out_link_remove;
ret = iommu_device_register(&data->iommu, &mtk_iommu_ops, dev);
if (ret)
goto out_sysfs_remove;
if (MTK_IOMMU_HAS_FLAG(data->plat_data, SHARE_PGTABLE)) {
list_add_tail(&data->list, data->plat_data->hw_list);
data->hw_list = data->plat_data->hw_list;
@@ -1372,19 +1363,28 @@ static int mtk_iommu_probe(struct platform_device *pdev)
data->hw_list = &data->hw_list_head;
}
ret = iommu_device_sysfs_add(&data->iommu, dev, NULL,
"mtk-iommu.%pa", &ioaddr);
if (ret)
goto out_list_del;
ret = iommu_device_register(&data->iommu, &mtk_iommu_ops, dev);
if (ret)
goto out_sysfs_remove;
if (MTK_IOMMU_IS_TYPE(data->plat_data, MTK_IOMMU_TYPE_MM)) {
ret = component_master_add_with_match(dev, &mtk_iommu_com_ops, match);
if (ret)
goto out_list_del;
goto out_device_unregister;
}
return ret;
out_list_del:
list_del(&data->list);
out_device_unregister:
iommu_device_unregister(&data->iommu);
out_sysfs_remove:
iommu_device_sysfs_remove(&data->iommu);
out_link_remove:
out_list_del:
list_del(&data->list);
if (MTK_IOMMU_IS_TYPE(data->plat_data, MTK_IOMMU_TYPE_MM))
device_link_remove(data->smicomm_dev, dev);
out_runtime_disable: