linux-kernel - Re: [PATCH v2] regulator: core: Use different devices for resource allocation and DT lookup

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Message-Id: <167050854689.183709.17486516496456151482.b4-ty@kernel.org>
Date:   Thu, 08 Dec 2022 14:09:06 +0000
From:   Mark Brown <broonie@...nel.org>
To:     cy_huang <u0084500@...il.com>
Cc:     djrscally@...il.com, hdegoede@...hat.com, markgross@...nel.org,
        lgirdwood@...il.com, mcoquelin.stm32@...il.com,
        alexandre.torgue@...s.st.com, yangyingliang@...wei.com,
        gene_chen@...htek.com, chiaen_wu@...htek.com,
        platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org,
        ChiYuan Huang <cy_huang@...htek.com>
Subject: Re: [PATCH v2] regulator: core: Use different devices for resource
 allocation and DT lookup

On Tue, 06 Dec 2022 15:22:21 +0800, cy_huang wrote:
> 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()
> 
> [...]

Applied to

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator.git for-next

Thanks!

[1/1] regulator: core: Use different devices for resource allocation and DT lookup
      commit: 8f3cbcd6b440032ebc7f7d48a1689dcc70a4eb98

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark