linux-kernel - [PATCH] iommu/sun50i: check return value of of_find_device_by_node() in sun50i_iommu_of

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Date:   Thu, 29 Oct 2020 17:22:44 +0800
From:   Yu Kuai <yukuai3@...wei.com>
To:     <joro@...tes.org>, <mripard@...nel.org>, <wens@...e.org>
CC:     <iommu@...ts.linux-foundation.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <yukuai3@...wei.com>,
        <yi.zhang@...wei.com>
Subject: [PATCH] iommu/sun50i: check return value of of_find_device_by_node() in sun50i_iommu_of_xlate()

If of_find_device_by_node() failed in sun50i_iommu_of_xlate(), null
pointer dereference will be triggered. Thus return error code if
of_find_device_by_node() failed.

Fixes: 4100b8c229b3("iommu: Add Allwinner H6 IOMMU driver")
Signed-off-by: Yu Kuai <yukuai3@...wei.com>
---
 drivers/iommu/sun50i-iommu.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/iommu/sun50i-iommu.c b/drivers/iommu/sun50i-iommu.c
index ea6db1341916..ce94ffa15215 100644
--- a/drivers/iommu/sun50i-iommu.c
+++ b/drivers/iommu/sun50i-iommu.c
@@ -764,6 +764,9 @@ static int sun50i_iommu_of_xlate(struct device *dev,
 	struct platform_device *iommu_pdev = of_find_device_by_node(args->np);
 	unsigned id = args->args[0];
 
+	if (!iommu_pdev)
+		return -ENODEV;
+
 	dev_iommu_priv_set(dev, platform_get_drvdata(iommu_pdev));
 
 	return iommu_fwspec_add_ids(dev, &id, 1);
-- 
2.25.4