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Message-ID: <20250317015352.GA218167@nchen-desktop>
Date: Mon, 17 Mar 2025 09:53:52 +0800
From: "Peter Chen (CIX)" <peter.chen@...nel.org>
To: Fedor Pchelkin <pchelkin@...ras.ru>
Cc: Frank Li <Frank.li@....com>,
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 v2 1/3] usb: chipidea: ci_hdrc_imx: fix usbmisc handling
On 25-03-16 13:26:54, 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.
>
> 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>
Acked-by: Peter Chen <peter.chen@...nel.org>
Peter
> ---
> 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
>
--
Best regards,
Peter
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