linux-kernel - Re: [PATCH] phy: qcom-qmp-combo: fix NULL-deref on runtime resume

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Message-ID: <20221026191324.ehk3zarmcboq32zn@halaney-x13s>
Date:   Wed, 26 Oct 2022 14:13:24 -0500
From:   Andrew Halaney <ahalaney@...hat.com>
To:     Johan Hovold <johan+linaro@...nel.org>
Cc:     Vinod Koul <vkoul@...nel.org>, Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH] phy: qcom-qmp-combo: fix NULL-deref on runtime resume

On Wed, Oct 26, 2022 at 06:21:16PM +0200, Johan Hovold wrote:
> Commit fc64623637da ("phy: qcom-qmp-combo,usb: add support for separate
> PCS_USB region") started treating the PCS_USB registers as potentially
> separate from the PCS registers but used the wrong base when no PCS_USB
> offset has been provided.
> 
> Fix the PCS_USB base used at runtime resume to prevent dereferencing a
> NULL pointer on platforms that do not provide a PCS_USB offset (e.g.
> SC7180).
> 
> Fixes: fc64623637da ("phy: qcom-qmp-combo,usb: add support for separate PCS_USB region")
> Cc: stable@...r.kernel.org	# 5.20
> Signed-off-by: Johan Hovold <johan+linaro@...nel.org>

Reviewed-by: Andrew Halaney <ahalaney@...hat.com>

For what it is worth, I double checked and phy-qcom-qmp-usb.c has this
done properly already.

Thanks,
Andrew

> ---
>  drivers/phy/qualcomm/phy-qcom-qmp-combo.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-combo.c b/drivers/phy/qualcomm/phy-qcom-qmp-combo.c
> index f6328434c61e..ad6a0fd7ba8e 100644
> --- a/drivers/phy/qualcomm/phy-qcom-qmp-combo.c
> +++ b/drivers/phy/qualcomm/phy-qcom-qmp-combo.c
> @@ -2144,7 +2144,7 @@ static void qmp_combo_enable_autonomous_mode(struct qmp_phy *qphy)
>  static void qmp_combo_disable_autonomous_mode(struct qmp_phy *qphy)
>  {
>  	const struct qmp_phy_cfg *cfg = qphy->cfg;
> -	void __iomem *pcs_usb = qphy->pcs_usb ?: qphy->pcs_usb;
> +	void __iomem *pcs_usb = qphy->pcs_usb ?: qphy->pcs;
>  	void __iomem *pcs_misc = qphy->pcs_misc;
>  
>  	/* Disable i/o clamp_n on resume for normal mode */
> -- 
> 2.37.3
>