linux-kernel - Re: [PATCH v1] power: supply: ltc2941-battery-gauge: fix use-after-free

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Message-ID: <20191020211553.cjfdpvhyqilhsbh4@earth.universe>
Date:   Sun, 20 Oct 2019 23:15:53 +0200
From:   Sebastian Reichel <sre@...nel.org>
To:     Sven Van Asbroeck <thesven73@...il.com>
Cc:     linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable <stable@...r.kernel.org>
Subject: Re: [PATCH v1] power: supply: ltc2941-battery-gauge: fix
 use-after-free

Hi,

On Thu, Sep 19, 2019 at 11:11:37AM -0400, Sven Van Asbroeck wrote:
> This driver's remove path calls cancel_delayed_work().
> However, that function does not wait until the work function
> finishes. This could mean that the work function is still
> running after the driver's remove function has finished,
> which would result in a use-after-free.
> 
> Fix by calling cancel_delayed_work_sync(), which ensures that
> that the work is properly cancelled, no longer running, and
> unable to re-schedule itself.
> 
> This issue was detected with the help of Coccinelle.
> 
> Cc: stable <stable@...r.kernel.org>
> Signed-off-by: Sven Van Asbroeck <TheSven73@...il.com>
> ---

Thanks, queued.

-- Sebastian

>  drivers/power/supply/ltc2941-battery-gauge.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/power/supply/ltc2941-battery-gauge.c b/drivers/power/supply/ltc2941-battery-gauge.c
> index da49436176cd..30a9014b2f95 100644
> --- a/drivers/power/supply/ltc2941-battery-gauge.c
> +++ b/drivers/power/supply/ltc2941-battery-gauge.c
> @@ -449,7 +449,7 @@ static int ltc294x_i2c_remove(struct i2c_client *client)
>  {
>  	struct ltc294x_info *info = i2c_get_clientdata(client);
>  
> -	cancel_delayed_work(&info->work);
> +	cancel_delayed_work_sync(&info->work);
>  	power_supply_unregister(info->supply);
>  	return 0;
>  }
> -- 
> 2.17.1
> 

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