linux-kernel - [PATCH v2]iommu/qcom:fix local

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Message-Id: <20200418134703.1760-1-tangbin@cmss.chinamobile.com>
Date:   Sat, 18 Apr 2020 21:47:03 +0800
From:   Tang Bin <tangbin@...s.chinamobile.com>
To:     joro@...tes.org, agross@...nel.org, bjorn.andersson@...aro.org,
        robdclark@...il.com
Cc:     linux-arm-msm@...r.kernel.org, iommu@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org,
        Tang Bin <tangbin@...s.chinamobile.com>
Subject: [PATCH v2]iommu/qcom:fix local_base status check

The function qcom_iommu_device_probe() does not perform sufficient
error checking after executing devm_ioremap_resource(), which can
result in crashes if a critical error path is encountered.

Fixes: 0ae349a0f33f ("iommu/qcom: Add qcom_iommu")

Signed-off-by: Tang Bin <tangbin@...s.chinamobile.com>
---
v2:
 - fix commit message and add fixed tag
---
 drivers/iommu/qcom_iommu.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/qcom_iommu.c b/drivers/iommu/qcom_iommu.c
index 4328da0b0..b160cf140 100644
--- a/drivers/iommu/qcom_iommu.c
+++ b/drivers/iommu/qcom_iommu.c
@@ -813,8 +813,11 @@ static int qcom_iommu_device_probe(struct platform_device *pdev)
 	qcom_iommu->dev = dev;
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (res)
+	if (res) {
 		qcom_iommu->local_base = devm_ioremap_resource(dev, res);
+		if (IS_ERR(qcom_iommu->local_base))
+			return PTR_ERR(qcom_iommu->local_base);
+	}
 
 	qcom_iommu->iface_clk = devm_clk_get(dev, "iface");
 	if (IS_ERR(qcom_iommu->iface_clk)) {
-- 
2.20.1.windows.1