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iommu/qcom: Fix local_base status check 

commit b52649aee6243ea661905bdc5fbe28cc5f6dec76 upstream.

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: 0ae349a0f3 ("iommu/qcom: Add qcom_iommu")
Signed-off-by: Tang Bin <tangbin@cmss.chinamobile.com>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20200418134703.1760-1-tangbin@cmss.chinamobile.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tang Bin 2020-04-18 21:47:03 +08:00 committed by Greg Kroah-Hartman
parent 205757f476
commit de59f2fbe6
1 changed files with 4 additions and 1 deletions
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5
drivers/iommu/qcom_iommu.c
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@ -814,8 +814,11 @@ 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)) {