From: Yang Yingliang Date: Mon, 25 Apr 2022 11:45:25 +0000 (+0800) Subject: iommu/arm-smmu-v3: check return value after calling platform_get_resource() X-Git-Tag: v6.1-rc5~1205^2^4~1^2~7 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=b131fa8c1d2afd05d0b7598621114674289c2fbb;p=platform%2Fkernel%2Flinux-starfive.git iommu/arm-smmu-v3: check return value after calling platform_get_resource() It will cause null-ptr-deref if platform_get_resource() returns NULL, we need check the return value. Signed-off-by: Yang Yingliang Link: https://lore.kernel.org/r/20220425114525.2651143-1-yangyingliang@huawei.com Signed-off-by: Will Deacon --- 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 627a3ed..88817a3 100644 --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c @@ -3770,6 +3770,8 @@ 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;