linux-kernel - Re: [PATCH 1/2] mfd: twl4030-audio: fix sibling-node lookup

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Date:   Mon, 13 Nov 2017 22:13:42 +0200
From:   Peter Ujfalusi <peter.ujfalusi@...com>
To:     Johan Hovold <johan@...nel.org>, Tony Lindgren <tony@...mide.com>
CC:     Lee Jones <lee.jones@...aro.org>, <linux-omap@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, stable <stable@...r.kernel.org>
Subject: Re: [PATCH 1/2] mfd: twl4030-audio: fix sibling-node lookup

On 11/11/2017 05:38 PM, Johan Hovold wrote:
> A helper purported to look up a child node based on its name was using
> the wrong of-helper and ended up prematurely freeing the parent of-node
> while leaking any matching node.
> 
> To make things worse, any matching node would not even necessarily be a
> child node as the whole device tree was searched depth-first starting at
> the parent.

I think it is the same case as with the twl6040, there were no
of_get_child_by_name() when this was done...

Thanks for fixing it!

Acked-by: Peter Ujfalusi <peter.ujfalusi@...com>

> 
> Fixes: 019a7e6b7b31 ("mfd: twl4030-audio: Add DT support")
> Cc: stable <stable@...r.kernel.org>     # 3.7
> Cc: Peter Ujfalusi <peter.ujfalusi@...com>
> ---
>  drivers/mfd/twl4030-audio.c | 9 +++++++--
>  1 file changed, 7 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/mfd/twl4030-audio.c b/drivers/mfd/twl4030-audio.c
> index da16bf45fab4..dc94ffc6321a 100644
> --- a/drivers/mfd/twl4030-audio.c
> +++ b/drivers/mfd/twl4030-audio.c
> @@ -159,13 +159,18 @@ unsigned int twl4030_audio_get_mclk(void)
>  EXPORT_SYMBOL_GPL(twl4030_audio_get_mclk);
>  
>  static bool twl4030_audio_has_codec(struct twl4030_audio_data *pdata,
> -			      struct device_node *node)
> +			      struct device_node *parent)
>  {
> +	struct device_node *node;
> +
>  	if (pdata && pdata->codec)
>  		return true;
>  
> -	if (of_find_node_by_name(node, "codec"))
> +	node = of_get_child_by_name(parent, "codec");
> +	if (node) {
> +		of_node_put(node);
>  		return true;
> +	}
>  
>  	return false;
>  }
> 


-- 
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