linux-kernel - Re: [PATCH 1/3] usb: chipidea: ci_hdrc

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Message-ID: <Z878PqYbtep0mOrx@lizhi-Precision-Tower-5810>
Date: Mon, 10 Mar 2025 10:50:38 -0400
From: Frank Li <Frank.li@....com>
To: Fedor Pchelkin <pchelkin@...ras.ru>
Cc: Peter Chen <peter.chen@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>,
	Joe Hattori <joe@...is.s.u-tokyo.ac.jp>,
	Sebastian Reichel <sre@...nel.org>,
	Fabien Lahoudere <fabien.lahoudere@...labora.co.uk>,
	linux-usb@...r.kernel.org, imx@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	lvc-project@...uxtesting.org, stable@...r.kernel.org
Subject: Re: [PATCH 1/3] usb: chipidea: ci_hdrc_imx: fix usbmisc handling

On Sun, Mar 09, 2025 at 08:57:57PM +0300, Fedor Pchelkin wrote:
> usbmisc is an optional device property so it is totally valid for the
> corresponding data->usbmisc_data to have a NULL value.
>
> Check that before dereferencing the pointer.
>
> Found by Linux Verification Center (linuxtesting.org) with Svace static
> analysis tool.

I have not seen any words "linuxtesting.org" in linux source tree. I am
not sure if it reproducable for other people. So this sense have not
provide much useful information.

Fixes itself is good.

Frank

>
> Fixes: 74adad500346 ("usb: chipidea: ci_hdrc_imx: decrement device's refcount in .remove() and in the error path of .probe()")
> Cc: stable@...r.kernel.org
> Signed-off-by: Fedor Pchelkin <pchelkin@...ras.ru>
> ---
>  drivers/usb/chipidea/ci_hdrc_imx.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/usb/chipidea/ci_hdrc_imx.c b/drivers/usb/chipidea/ci_hdrc_imx.c
> index 1a7fc638213e..619779eef333 100644
> --- a/drivers/usb/chipidea/ci_hdrc_imx.c
> +++ b/drivers/usb/chipidea/ci_hdrc_imx.c
> @@ -534,7 +534,8 @@ static int ci_hdrc_imx_probe(struct platform_device *pdev)
>  		cpu_latency_qos_remove_request(&data->pm_qos_req);
>  	data->ci_pdev = NULL;
>  err_put:
> -	put_device(data->usbmisc_data->dev);
> +	if (data->usbmisc_data)
> +		put_device(data->usbmisc_data->dev);
>  	return ret;
>  }
>
> @@ -559,7 +560,8 @@ static void ci_hdrc_imx_remove(struct platform_device *pdev)
>  		if (data->hsic_pad_regulator)
>  			regulator_disable(data->hsic_pad_regulator);
>  	}
> -	put_device(data->usbmisc_data->dev);
> +	if (data->usbmisc_data)
> +		put_device(data->usbmisc_data->dev);
>  }
>
>  static void ci_hdrc_imx_shutdown(struct platform_device *pdev)
> --
> 2.48.1
>