linux-kernel - Re: [PATCH 2/2] ASoC: samsung: odroid: fix a double-free issue for cpu

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Message-ID: <CAJKOXPdY7xqcBJzU6pe1pSmpbNoBY6yh0rih2t4XGXaYWP3WfA@mail.gmail.com>
Date:   Tue, 16 Jul 2019 11:06:43 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Wen Yang <wen.yang99@....com.cn>
Cc:     sbkim73@...sung.com, s.nawrocki@...sung.com, lgirdwood@...il.com,
        broonie@...nel.org, perex@...ex.cz, tiwai@...e.com,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        xue.zhihong@....com.cn, wang.yi59@....com.cn,
        cheng.shengyu@....com.cn
Subject: Re: [PATCH 2/2] ASoC: samsung: odroid: fix a double-free issue for cpu_dai

On Sat, 13 Jul 2019 at 05:48, Wen Yang <wen.yang99@....com.cn> wrote:
>
> The cpu_dai variable is still being used after the of_node_put() call,
> which may result in double-free:
>
>         of_node_put(cpu_dai);            ---> released here
>
>         ret = devm_snd_soc_register_card(dev, card);
>         if (ret < 0) {
> ...
>                 goto err_put_clk_i2s;    --> jump to err_put_clk_i2s
> ...
>
> err_put_clk_i2s:
>         clk_put(priv->clk_i2s_bus);
> err_put_sclk:
>         clk_put(priv->sclk_i2s);
> err_put_cpu_dai:
>         of_node_put(cpu_dai);            --> double-free here
>
> Fixes: d832d2b246c5 ("ASoC: samsung: odroid: Fix of_node refcount unbalance")
> Signed-off-by: Wen Yang <wen.yang99@....com.cn>
> Cc: Krzysztof Kozlowski <krzk@...nel.org>
> Cc: Sangbeom Kim <sbkim73@...sung.com>
> Cc: Sylwester Nawrocki <s.nawrocki@...sung.com>
> Cc: Liam Girdwood <lgirdwood@...il.com>
> Cc: Mark Brown <broonie@...nel.org>
> Cc: Jaroslav Kysela <perex@...ex.cz>
> Cc: Takashi Iwai <tiwai@...e.com>
> Cc: alsa-devel@...a-project.org
> Cc: linux-kernel@...r.kernel.org
> ---
>  sound/soc/samsung/odroid.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>

Reviewed-by: Krzysztof Kozlowski <krzk@...nel.org>

Best regards,
Krzysztof