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 11:04:56 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Dan Carpenter <dan.carpenter@...cle.com>
Cc:     Bartosz Golaszewski <bgolaszewski@...libre.com>,
        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

pon., 24 cze 2019 o 11:04 Dan Carpenter <dan.carpenter@...cle.com> napisał(a):
>
> 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
>

Noted, I'll be sending a new version of this driver to Daniel anyway,
so I'll include it.

Thanks,
Bart