linux-kernel - Re: [PATCH] ASoC: codecs: lpass-wsa-macro: Check for error pointer after calling devm_regmap_init

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Date:   Mon, 10 Jan 2022 17:51:17 +0100
From:   Cezary Rojewski <cezary.rojewski@...el.com>
To:     Jiasheng Jiang <jiasheng@...as.ac.cn>,
        <srinivas.kandagatla@...aro.org>, <bgoswami@...eaurora.org>,
        <lgirdwood@...il.com>, <broonie@...nel.org>, <perex@...ex.cz>,
        <tiwai@...e.com>
CC:     <alsa-devel@...a-project.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ASoC: codecs: lpass-wsa-macro: Check for error pointer
 after calling devm_regmap_init_mmio

On 2022-01-10 7:42 AM, Jiasheng Jiang wrote:
> The devm_regmap_init_mmio() may return error pointer in some cases, for
> example the possible failure of the kzalloc() in
> regmap_mmio_gen_context().
> Then the wsa->regmap will be error pointer and be used in
> wsa_macro_mclk_enable().
> Therefore, it should be better to check it in order to avoid the
> dereference of the error pointer.
> 
> Fixes: 809bcbcecebf ("ASoC: codecs: lpass-wsa-macro: Add support to WSA Macro")
> Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
> ---
>   sound/soc/codecs/lpass-wsa-macro.c | 2 ++
>   1 file changed, 2 insertions(+)
> 
> diff --git a/sound/soc/codecs/lpass-wsa-macro.c b/sound/soc/codecs/lpass-wsa-macro.c
> index d3ac318fd6b6..dd1a8b7bc794 100644
> --- a/sound/soc/codecs/lpass-wsa-macro.c
> +++ b/sound/soc/codecs/lpass-wsa-macro.c
> @@ -2405,6 +2405,8 @@ static int wsa_macro_probe(struct platform_device *pdev)
>   		return PTR_ERR(base);
>   
>   	wsa->regmap = devm_regmap_init_mmio(dev, base, &wsa_regmap_config);
> +	if (IS_ERR(wsa->regmap))
> +		return PTR_ERR(wsa->regmap);
>   
>   	dev_set_drvdata(dev, wsa);
>   
> 

Hello,

Perhaps the cover-letter did not yet arrive, however, it would be good 
to bundle similar patches together and provide a cover letter for such 
series in the future.

I'm replying to the very first patch sent, but it's quite obvious that 
lpass-rx and lpass-tx patches are related to this one and it is easier 
to get a firm grasp over the changes - from reviewer's point of view - 
if all the related ones are part of a single series.


Regards,
Czarek