linux-kernel - Re: [PATCH v2] ASoC: mediatek: Fix error handling in mt8183_da7219_max98357_dev

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Date:   Wed, 16 Mar 2022 10:32:16 +0800
From:   Tzung-Bi Shih <tzungbi@...nel.org>
To:     Miaoqian Lin <linmq006@...il.com>
Cc:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Jiaxin Yu <jiaxin.yu@...iatek.com>,
        Shunli Wang <shunli.wang@...iatek.com>,
        alsa-devel@...a-project.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] ASoC: mediatek: Fix error handling in
 mt8183_da7219_max98357_dev_probe

On Wed, Mar 16, 2022 at 01:40:57AM +0000, Miaoqian Lin wrote:
> The device_node pointer is returned by of_parse_phandle()  with refcount
> incremented. We should use of_node_put() on it when done.
> 
> This function only calls of_node_put() in the regular path.
> And it will cause refcount leak in error paths.
> Fix this by calling of_node_put() in error handling too.
> 
> Fixes: 5bdbe9771177 ("ASoC: mediatek: mt8183-da7219: use hdmi-codec")
> Fixes: ebbddc75bbe8 ("ASoC: Mediatek: MT8183: Add machine driver with DA7219")

Again, I am not sure if the Fixes tag makes sense.  Although the issue was
there when the driver birth, there are some more commits after then.

Given that:
- The patch is a minor fix (see [1][2]).
- There is no specific commit the patch aims to fix.
I prefer to drop the Fixes tags.  In any case, I don't think the tags would be
helpful.

I would defer to Mark.

[1]: https://elixir.bootlin.com/linux/v5.17-rc8/source/include/linux/of.h#L129
[2]: https://elixir.bootlin.com/linux/v5.17-rc8/source/drivers/of/Kconfig#L55

> Signed-off-by: Miaoqian Lin <linmq006@...il.com>

Reviewed-by: Tzung-Bi Shih <tzungbi@...nel.org>