linux-kernel - Re: [PATCH v2] regulator: da9063: fix null pointer deref with partial DT config

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Message-Id: <168747606054.325012.10021476177510722363.b4-ty@kernel.org>
Date:   Fri, 23 Jun 2023 00:21:00 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Martin Fuzzey <martin.fuzzey@...wbird.group>
Cc:     Support Opensource <support.opensource@...semi.com>,
        Benjamin Bara <benjamin.bara@...data.com>,
        Adam Ward <DLG-Adam.Ward.opensource@...renesas.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] regulator: da9063: fix null pointer deref with
 partial DT config

On Thu, 22 Jun 2023 17:11:02 +0200, Martin Fuzzey wrote:
> When some of the da9063 regulators do not have corresponding DT nodes
> a null pointer dereference occurs on boot:
> 
> [    1.559034] 8<--- cut here ---
> [    1.564014] Unable to handle kernel NULL pointer dereference at virtual address 00000098 when read
> [    1.578055] [00000098] *pgd=00000000
> [    1.593575] Internal error: Oops: 5 [#1] SMP ARM
> [    1.634870] PC is at da9063_regulator_probe+0x35c/0x788
> [    1.647934] LR is at da9063_regulator_probe+0x2e8/0x788
> [    2.073626]  da9063_regulator_probe from platform_probe+0x58/0xb8
> [    2.079759]  platform_probe from really_probe+0xd8/0x3c0
> [    2.085092]  really_probe from __driver_probe_device+0x94/0x1e8
> [    2.091026]  __driver_probe_device from driver_probe_device+0x2c/0xd0
> [    2.097479]  driver_probe_device from __device_attach_driver+0xa4/0x11c
> [    2.104107]  __device_attach_driver from bus_for_each_drv+0x84/0xdc
> [    2.110402]  bus_for_each_drv from __device_attach_async_helper+0xb0/0x110
> [    2.117295]  __device_attach_async_helper from async_run_entry_fn+0x3c/0x158
> [    2.124369]  async_run_entry_fn from process_one_work+0x1d4/0x3e4
> [    2.130485]  process_one_work from worker_thread+0x30/0x520
> [    2.136070]  worker_thread from kthread+0xdc/0xfc
> 
> [...]

Applied to

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

Thanks!

[1/1] regulator: da9063: fix null pointer deref with partial DT config
      commit: b9e6bee2bcb144d0eac0ac3d8826ae73c54a50df

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