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: v5.17.15~162 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=db728a891f9177b044aaca89b678f6b5e24d5cc3;p=thirdparty%2Fkernel%2Fstable.git 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 Link: https://lore.kernel.org/r/20220425114525.2651143-1-yangyingliang@huawei.com Signed-off-by: Will Deacon Signed-off-by: Sasha Levin --- 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 f60381cdf1c48..a009a3dd762bc 100644 --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c @@ -3780,6 +3780,8 @@ 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;