ChiYuan Huang cb29811d98 regulator: core: Use different devices for resource allocation and DT lookup ... [ Upstream commit 8f3cbcd6b4 ] Following by the below discussion, there's the potential UAF issue between regulator and mfd. https://lore.kernel.org/all/20221128143601.1698148-1-yangyingliang@huawei.com/ From the analysis of Yingliang CPU A |CPU B mt6370_probe() | devm_mfd_add_devices() | |mt6370_regulator_probe() | regulator_register() | //allocate init_data and add it to devres | regulator_of_get_init_data() i2c_unregister_device() | device_del() | devres_release_all() | // init_data is freed | release_nodes() | | // using init_data causes UAF | regulator_register() It's common to use mfd core to create child device for the regulator. In order to do the DT lookup for init data, the child that registered the regulator would pass its parent as the parameter. And this causes init data resource allocated to its parent, not itself. The issue happen when parent device is going to release and regulator core is still doing some operation of init data constraint for the regulator of child device. To fix it, this patch expand 'regulator_register' API to use the different devices for init data allocation and DT lookup. Reported-by: Yang Yingliang <yangyingliang@huawei.com> Signed-off-by: ChiYuan Huang <cy_huang@richtek.com> Link: https://lore.kernel.org/r/1670311341-32664-1-git-send-email-u0084500@gmail.com Signed-off-by: Mark Brown <broonie@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>		2022-12-31 13:26:47 +01:00
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chrome	platform/chrome: cros_ec_typec: zero out stale pointers	2022-12-31 13:25:47 +01:00
goldfish	platform: goldfish: pipe: Use platform_get_irq() to get the interrupt	2022-03-18 13:55:21 +01:00
mellanox	platform/mellanox: mlxbf-pmc: Fix event typo	2022-12-31 13:25:48 +01:00
mips	MIPS: Loongson-3: fix compile mips cpu_hwmon as module build error.	2022-06-09 22:24:19 +02:00
olpc	platform/olpc: Fix uninitialized data in debugfs write	2022-07-28 20:40:15 +02:00
surface	platform/surface: aggregator_registry: Add support for Surface Laptop 5	2022-12-02 17:43:15 +01:00
x86	regulator: core: Use different devices for resource allocation and DT lookup	2022-12-31 13:26:47 +01:00
Kconfig	platform/x86: Kconfig: Remove unnecessary "if X86"	2022-06-27 09:37:49 +02:00
Makefile	platform: Add Surface platform directory	2020-10-27 12:51:03 +01:00