linux-kernel - [PATCH AUTOSEL 4.19 20/20] iommu/qcom: Fix local

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Message-Id: <20200507142917.26612-20-sashal@kernel.org>
Date:   Thu,  7 May 2020 10:29:16 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Tang Bin <tangbin@...s.chinamobile.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Joerg Roedel <jroedel@...e.de>,
        Sasha Levin <sashal@...nel.org>, linux-arm-msm@...r.kernel.org,
        iommu@...ts.linux-foundation.org
Subject: [PATCH AUTOSEL 4.19 20/20] iommu/qcom: Fix local_base status check

From: Tang Bin <tangbin@...s.chinamobile.com>

[ Upstream commit b52649aee6243ea661905bdc5fbe28cc5f6dec76 ]

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>
Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>
Link: https://lore.kernel.org/r/20200418134703.1760-1-tangbin@cmss.chinamobile.com
Signed-off-by: Joerg Roedel <jroedel@...e.de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 9a6ed5eeaad16..b0a4a3d2f60ea 100644
--- a/drivers/iommu/qcom_iommu.c
+++ b/drivers/iommu/qcom_iommu.c
@@ -797,8 +797,11 @@ 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