linux-kernel - Re: [alsa-devel] [PATCH v2] ASoC: Intel: Skylake: prevent memory leak in snd_skl_parse

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Message-ID: <CAHp75Veung3v41RMmBoQHE7TFWUccE2oXsVnNgUt0JE0naTfLw@mail.gmail.com>
Date:   Fri, 27 Sep 2019 23:39:22 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Cezary Rojewski <cezary.rojewski@...el.com>,
        ALSA Development Mailing List <alsa-devel@...a-project.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jie Yang <yang.jie@...ux.intel.com>,
        Mark Brown <broonie@...nel.org>, Takashi Iwai <tiwai@...e.com>,
        Kangjie Lu <kjlu@....edu>,
        Liam Girdwood <liam.r.girdwood@...ux.intel.com>,
        Navid Emamdoost <emamd001@....edu>,
        Stephen McCamant <smccaman@....edu>,
        Thomas Gleixner <tglx@...utronix.de>,
        Enrico Weigelt <info@...ux.net>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Navid Emamdoost <navid.emamdoost@...il.com>
Subject: Re: [alsa-devel] [PATCH v2] ASoC: Intel: Skylake: prevent memory leak
 in snd_skl_parse_uuids

On Fri, Sep 27, 2019 at 7:39 PM Pierre-Louis Bossart
<pierre-louis.bossart@...ux.intel.com> wrote:
> > The problem with solution #1 is freeing orphaned pointer. It will work,
> > but it's simple is not okay from object life time prospective.
>
> ?? I don't get your point at all Andy.
> Two allocations happens in a loop and if the second fails, you free the
> first and then jump to free everything allocated in the previous
> iterations. what am I missing?

Two things:
 - one allocation is done with kzalloc(), while the other one with
devm_kcalloc()
 - due to above the ordering of resources is reversed

-- 
With Best Regards,
Andy Shevchenko