linux-kernel - Re: [PATCH v2] phy: qcom-qmp-usb: Fix an NULL vs IS

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Message-ID: <x2hqk3yabe3ntp4b452tseyuuen76mtttievka7zgjajxxxobb@srrgiu7k6eyp>
Date: Tue, 15 Apr 2025 13:26:32 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Chenyuan Yang <chenyuan0y@...il.com>
Cc: vkoul@...nel.org, kishon@...nel.org, lumag@...nel.org,
        quic_kriskura@...cinc.com, manivannan.sadhasivam@...aro.org,
        konrad.dybcio@....qualcomm.com, quic_varada@...cinc.com,
        quic_kbajaj@...cinc.com, johan+linaro@...nel.org,
        linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Johan Hovold <johan@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>
Subject: Re: [PATCH v2] phy: qcom-qmp-usb: Fix an NULL vs IS_ERR() bug

On Mon, Apr 14, 2025 at 07:50:50AM -0500, Chenyuan Yang wrote:
> The qmp_usb_iomap() helper function currently returns the raw result of
> devm_ioremap() for non-exclusive mappings. Since devm_ioremap() may return
> a NULL pointer and the caller only checks error pointers with IS_ERR(),
> NULL could bypass the check and lead to an invalid dereference.
> 
> Fix the issue by checking if devm_ioremap() returns NULL. When it does,
> qmp_usb_iomap() now returns an error pointer via IOMEM_ERR_PTR(-ENOMEM),
> ensuring safe and consistent error handling.
> 
> Signed-off-by: Chenyuan Yang <chenyuan0y@...il.com>
> Fixes: a5d6b1ac56cb ("phy: qcom-qmp-usb: fix memleak on probe deferral")
> CC: Johan Hovold <johan@...nel.org>
> CC: Krzysztof Kozlowski <krzk@...nel.org>
> ---
>  drivers/phy/qualcomm/phy-qcom-qmp-usb.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>

-- 
With best wishes
Dmitry