linux-kernel - Re: [RFT PATCH 1/4] power_supply: twl4030_madc: Check return value of power_supply

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Message-ID: <CAAfyv34YoUG8dyq10mFZRQ-uf6-oT_KAbwZ1UQQ0FvFrs10BrQ@mail.gmail.com>
Date:	Tue, 27 Jan 2015 22:06:12 +0100
From:	Belisko Marek <marek.belisko@...il.com>
To:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
Cc:	Dmitry Artamonow <mad_soft@...ox.ru>,
	Cezary Jackiewicz <cezary.jackiewicz@...il.com>,
	Darren Hart <dvhart@...radead.org>,
	Sebastian Reichel <sre@...nel.org>,
	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
	David Woodhouse <dwmw2@...radead.org>,
	platform-driver-x86@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>,
	Linux PM mailing list <linux-pm@...r.kernel.org>,
	stable@...r.kernel.org
Subject: Re: [RFT PATCH 1/4] power_supply: twl4030_madc: Check return value of power_supply_register

Hi Krzystof,

On Tue, Jan 27, 2015 at 12:30 PM, Krzysztof Kozlowski
<k.kozlowski@...sung.com> wrote:
> The return value of power_supply_register() call was not checked and
> even on error probe() function returned 0. If registering failed then
> during unbind the driver tried to unregister power supply which was not
> actually registered.
>
> This could lead to memory corruption because power_supply_unregister()
> unconditionally cleans up given power supply.
>
> Signed-off-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>
> Fixes: da0a00ebc239 ("power: Add twl4030_madc battery driver.")
> Cc: <stable@...r.kernel.org>
> ---
>  drivers/power/twl4030_madc_battery.c | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/power/twl4030_madc_battery.c b/drivers/power/twl4030_madc_battery.c
> index 7ef445a6cfa6..cf907609ec49 100644
> --- a/drivers/power/twl4030_madc_battery.c
> +++ b/drivers/power/twl4030_madc_battery.c
> @@ -192,6 +192,7 @@ static int twl4030_madc_battery_probe(struct platform_device *pdev)
>  {
>         struct twl4030_madc_battery *twl4030_madc_bat;
>         struct twl4030_madc_bat_platform_data *pdata = pdev->dev.platform_data;
> +       int ret = 0;
>
>         twl4030_madc_bat = kzalloc(sizeof(*twl4030_madc_bat), GFP_KERNEL);
>         if (!twl4030_madc_bat)
> @@ -216,9 +217,11 @@ static int twl4030_madc_battery_probe(struct platform_device *pdev)
>
>         twl4030_madc_bat->pdata = pdata;
>         platform_set_drvdata(pdev, twl4030_madc_bat);
> -       power_supply_register(&pdev->dev, &twl4030_madc_bat->psy);
> +       ret = power_supply_register(&pdev->dev, &twl4030_madc_bat->psy);
> +       if (ret < 0)
> +               kfree(twl4030_madc_bat);
I post update twl4030_madc to iio some time ago [1] where this change
was incorporated.
I plan to respin in next week so we can drop this one (or take and
I'll rebase on top).
>
> -       return 0;
> +       return ret;
>  }
>
>  static int twl4030_madc_battery_remove(struct platform_device *pdev)
> --
> 1.9.1
>

[1] - https://lkml.org/lkml/2014/3/5/284

BR,

marek

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