linux-kernel - Re: [PATCH][next] clocksource: davinci-timer: fix memory leak of clockevent on error return

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Date:   Mon, 24 Jun 2019 12:03:39 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Bartosz Golaszewski <bgolaszewski@...libre.com>
Cc:     Colin King <colin.king@...onical.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        kernel-janitors@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH][next] clocksource: davinci-timer: fix memory leak of
 clockevent on error return

On Mon, Jun 24, 2019 at 10:28:10AM +0200, Bartosz Golaszewski wrote:
> pon., 17 cze 2019 o 13:31 Colin King <colin.king@...onical.com> napisał(a):
> >
> > From: Colin Ian King <colin.king@...onical.com>
> >
> > Currently when the call to request_irq falls there is a memory leak of
> > clockevent on the error return path. Fix this by kfree'ing clockevent.
> >
> > Addresses-Coverity: ("Resource leak")
> > Fixes: fe3b8194f274 ("clocksource: davinci-timer: add support for clockevents")
> > Signed-off-by: Colin Ian King <colin.king@...onical.com>
> > ---
> >  drivers/clocksource/timer-davinci.c | 1 +
> >  1 file changed, 1 insertion(+)
> >
> > diff --git a/drivers/clocksource/timer-davinci.c b/drivers/clocksource/timer-davinci.c
> > index a9ca02390b66..8512f12e250a 100644
> > --- a/drivers/clocksource/timer-davinci.c
> > +++ b/drivers/clocksource/timer-davinci.c
> > @@ -300,6 +300,7 @@ int __init davinci_timer_register(struct clk *clk,
> >                          "clockevent/tim12", clockevent);
> >         if (rv) {
> >                 pr_err("Unable to request the clockevent interrupt");
> > +               kfree(clockevent);
> >                 return rv;
> >         }
> >
> > --
> > 2.20.1
> >
> 
> Hi Colin,
> 
> I omitted the error checking in this driver on purpose - it doesn't
> make sense as the system won't boot without a timer.

One way to silence these static checker warnings is to use
"GFP_KERNEL | __GFP_NOFAIL".

regards,
dan carpenter