iommu/arm-smmu-v3: check return value after calling platform_get_resource()

[ Upstream commit b131fa8c1d2afd05d0b7598621114674289c2fbb ]

It will cause null-ptr-deref if platform_get_resource() returns NULL,
we need check the return value.

Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Link: https://lore.kernel.org/r/20220425114525.2651143-1-yangyingliang@huawei.com
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
index 4303151..79edfdc 100644 (file)
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -3786,6 +3786,8 @@ static int arm_smmu_device_probe(struct platform_device *pdev)
 
        /* Base address */
        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+       if (!res)
+               return -EINVAL;
        if (resource_size(res) < arm_smmu_resource_size(smmu)) {
                dev_err(dev, "MMIO region too small (%pr)\n", res);
                return -EINVAL;