linux-kernel - RE: [PATCH V2 2/2] clocksource: imx-gpt: add necessary kfree to avoid resource leak

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Message-ID: <DB3PR0402MB39161E47E47937FDB8046B6EF5CB0@DB3PR0402MB3916.eurprd04.prod.outlook.com>
Date:   Tue, 6 Nov 2018 01:38:48 +0000
From:   Anson Huang <anson.huang@....com>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     dl-linux-imx <linux-imx@....com>
Subject: RE: [PATCH V2 2/2] clocksource: imx-gpt: add necessary kfree to avoid
 resource leak

Hi, Daniel

Best Regards!
Anson Huang

> -----Original Message-----
> From: Daniel Lezcano [mailto:daniel.lezcano@...aro.org]
> Sent: 2018年11月5日 21:35
> To: Anson Huang <anson.huang@....com>; tglx@...utronix.de;
> linux-kernel@...r.kernel.org
> Cc: dl-linux-imx <linux-imx@....com>
> Subject: Re: [PATCH V2 2/2] clocksource: imx-gpt: add necessary kfree to avoid
> resource leak
> 
> Hi Anson,
> 
> On 05/11/2018 02:10, Anson Huang wrote:
> > kfree should be called to free resource in error path before return.
> >
> > Signed-off-by: Anson Huang <Anson.Huang@....com>
> > ---
> >  drivers/clocksource/timer-imx-gpt.c | 8 ++++++--
> >  1 file changed, 6 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/clocksource/timer-imx-gpt.c
> > b/drivers/clocksource/timer-imx-gpt.c
> > index a3d6ccb..0f78b30 100644
> > --- a/drivers/clocksource/timer-imx-gpt.c
> > +++ b/drivers/clocksource/timer-imx-gpt.c
> > @@ -477,12 +477,16 @@ static int __init mxc_timer_init_dt(struct
> device_node *np,  enum imx_gpt_type t
> >  		return -ENOMEM;
> >
> >  	imxtm->base = of_iomap(np, 0);
> > -	if (!imxtm->base)
> > +	if (!imxtm->base) {
> > +		kfree(imxtm);
> >  		return -ENXIO;
> > +	}
> >
> >  	imxtm->irq = irq_of_parse_and_map(np, 0);
> > -	if (imxtm->irq <= 0)
> > +	if (imxtm->irq <= 0) {
> > +		kfree(imxtm);
> >  		return -EINVAL;
> > +	}
> >
> >  	imxtm->clk_ipg = of_clk_get_by_name(np, "ipg");
> 
> Please convert to timer-of API.

This patch mainly to fix the potential resource leak issue, for converting
to timer-of API, should I add another patch for it? Since it is a different
subject.

Thanks.

Anson

> 
> Thanks
> 
>   -- Daniel
> 
> 
> --
> 
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