linux-kernel - Re: [PATCH] pcm030-audio-fabric: Fix a memory leaking bug in pcm030_fabric

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Date:   Fri, 24 May 2019 10:30:09 +0100
From:   Jon Hunter <jonathanh@...dia.com>
To:     Gen Zhang <blackgod016574@...il.com>, <broonie@...nel.org>,
        <tiwai@...e.com>
CC:     <alsa-devel@...a-project.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] pcm030-audio-fabric: Fix a memory leaking bug in
 pcm030_fabric_probe()


On 24/05/2019 03:12, Gen Zhang wrote:
> In pcm030_fabric_probe(), 'pdata->codec_device' is allocated by
> platform_device_alloc(). When this allocation fails, ENOMEM is returned.
> However, 'pdata' is allocated by devm_kzalloc() before this site. We
> should free 'pdata' before function ends to prevent memory leaking.
> 
> Similarly, we should free 'pdata' when 'pdata->codec_device' is NULL.
> And we should free 'pdata->codec_device' and 'pdata' when 'ret' is error
> to prevent memory leaking.
> 
> Signed-off-by: Gen Zhang <blackgod016574@...il.com>

I have seen several of these patches now, and this is not correct. I
think you need to understand how devm_kzalloc() works.

Jon

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