linux-kernel - Re: [PATCH RESEND] twl4030_charger: fix charging current out-of-bounds

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Message-ID: <20180920002052.xex3xdrvzkb7wf7k@earth.universe>
Date:   Thu, 20 Sep 2018 02:20:52 +0200
From:   Sebastian Reichel <sebastian.reichel@...labora.com>
To:     Andreas Kemnade <andreas@...nade.info>
Cc:     linux-pm@...r.kernel.org, linux-omap@...r.kernel.org,
        Discussions about the Letux Kernel 
        <letux-kernel@...nphoenux.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND] twl4030_charger: fix charging current
 out-of-bounds

Hi,

On Mon, Sep 17, 2018 at 07:20:35AM +0200, Andreas Kemnade wrote:
> the charging current uses unsigned int variables, if we step back
> if the current is still low, we would run into negative which
> means setting the target to a huge value.
> Better add checks here.
> 
> Signed-off-by: Andreas Kemnade <andreas@...nade.info>
> ---

Thanks, queued.

-- Sebastian

>  drivers/power/supply/twl4030_charger.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/power/supply/twl4030_charger.c b/drivers/power/supply/twl4030_charger.c
> index b72838663872..c954b7234393 100644
> --- a/drivers/power/supply/twl4030_charger.c
> +++ b/drivers/power/supply/twl4030_charger.c
> @@ -421,7 +421,8 @@ static void twl4030_current_worker(struct work_struct *data)
>  
>  	if (v < USB_MIN_VOLT) {
>  		/* Back up and stop adjusting. */
> -		bci->usb_cur -= USB_CUR_STEP;
> +		if (bci->usb_cur >= USB_CUR_STEP)
> +			bci->usb_cur -= USB_CUR_STEP;
>  		bci->usb_cur_target = bci->usb_cur;
>  	} else if (bci->usb_cur >= bci->usb_cur_target ||
>  		   bci->usb_cur + USB_CUR_STEP > USB_MAX_CURRENT) {
> -- 
> 2.11.0
> 

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