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

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[ 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>
This commit is contained in:
Yang Yingliang
2022-04-25 19:45:25 +08:00
committed by Greg Kroah-Hartman
parent 3660db29b0
commit 54c1e0e3bb
1 changed files with 2 additions and 0 deletions
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drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
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@@ -3512,6 +3512,8 @@ static int arm_smmu_device_probe(struct platform_device *pdev)
/* Base address */ /* Base address */
res = platform_get_resource(pdev, IORESOURCE_MEM, 0); res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
return -EINVAL;
if (resource_size(res) < arm_smmu_resource_size(smmu)) { if (resource_size(res) < arm_smmu_resource_size(smmu)) {
dev_err(dev, "MMIO region too small (%pr)\n", res); dev_err(dev, "MMIO region too small (%pr)\n", res);
return -EINVAL; return -EINVAL;