iommu/arm-smmu: fix possible null-ptr-deref in arm_smmu_device_probe()
stable inclusion from stable-v5.10.122 commit 3660db29b0305f9a1d95979c7af0f5db6ea99f5d category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I5W6OE Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=3660db29b0305f9a1d95979c7af0f5db6ea99f5d -------------------------------- [ Upstream commit d9ed8af1 ] It will cause null-ptr-deref when using 'res', if platform_get_resource() returns NULL, so move using 'res' after devm_ioremap_resource() that will check it to avoid null-ptr-deref. And use devm_platform_get_and_ioremap_resource() to simplify code. Signed-off-by: NYang Yingliang <yangyingliang@huawei.com> Link: https://lore.kernel.org/r/20220425114136.2649310-1-yangyingliang@huawei.comSigned-off-by: NWill Deacon <will@kernel.org> Signed-off-by: NSasha Levin <sashal@kernel.org> Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com> Reviewed-by: NWei Li <liwei391@huawei.com>
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