linux-kernel - Re: [PATCH] dmaengine: dw: dmamux: Fix device reference leak in rzn1_dmamux_route

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Message-ID: <CAH-r-ZHx+vcL3QY0rKP3Lo_qofYLSuxCxqyb=URPSbnStxA5cQ@mail.gmail.com>
Date: Tue, 2 Sep 2025 18:18:18 +0800
From: 林妙倩 <linmq006@...il.com>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc: Viresh Kumar <vireshk@...nel.org>, Vinod Koul <vkoul@...nel.org>, 
	Miquel Raynal <miquel.raynal@...tlin.com>, 
	Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>, 
	dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org, 
	stable@...r.kernel.org
Subject: Re: [PATCH] dmaengine: dw: dmamux: Fix device reference leak in rzn1_dmamux_route_allocate

Hi,

Andy Shevchenko <andriy.shevchenko@...ux.intel.com> 于2025年9月2日周二 17:37写道：
>
> On Tue, Sep 02, 2025 at 05:03:58PM +0800, Miaoqian Lin wrote:
> > The reference taken by of_find_device_by_node()
> > must be released when not needed anymore.
> > Add missing put_device() call to fix device reference leaks.
>
> How is this being found? Do you have a stacktrace or kmemleak reports?

This was found through static code analysis.
The of_find_device_by_node() documentation states that it
"takes a reference to the embedded struct device which needs to be
dropped after use."

I cross-referenced other of_find_device_by_node() usage patterns to
check the correct usage,
then audited this code and found the problem.

I don't have a stacktrace or kmemleak reports.

>
> --
> With Best Regards,
> Andy Shevchenko
>
>