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

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Message-ID: <CAMpxmJVxg2+2mdAQDSo5LTq=w7+ccXnwRmK+iz=4zkNhepE6pQ@mail.gmail.com>
Date:   Mon, 24 Jun 2019 10:28:10 +0200
From:   Bartosz Golaszewski <bgolaszewski@...libre.com>
To:     Colin King <colin.king@...onical.com>
Cc:     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., 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.

Bart