[PATCH 4.19 23/37] iommu/qcom: Fix local_base status check

From: Greg Kroah-Hartman
Date: Mon May 04 2020 - 14:12:30 EST


From: Tang Bin <tangbin@xxxxxxxxxxxxxxxxxxxx>

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: 0ae349a0f33f ("iommu/qcom: Add qcom_iommu")
Signed-off-by: Tang Bin <tangbin@xxxxxxxxxxxxxxxxxxxx>
Reviewed-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20200418134703.1760-1-tangbin@xxxxxxxxxxxxxxxxxxxx
Signed-off-by: Joerg Roedel <jroedel@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
drivers/iommu/qcom_iommu.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

--- a/drivers/iommu/qcom_iommu.c
+++ b/drivers/iommu/qcom_iommu.c
@@ -797,8 +797,11 @@ static int qcom_iommu_device_probe(struc
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)) {