linux-kernel - [PATCH 2/3] PCI: qcom: Prevent potential error pointer dereference

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Message-ID: <20240708180539.1447307-3-dan.carpenter@linaro.org>
Date: Tue,  9 Jul 2024 15:59:18 +0200
From: Anders Roxell <anders.roxell@...aro.org>
To: dan.carpenter@...aro.org,
	Krishna chaitanya chundru <quic_krichai@...cinc.com>
Cc: bhelgaas@...gle.com,
	kw@...ux.com,
	linux-arm-msm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org,
	lpieralisi@...nel.org,
	manivannan.sadhasivam@...aro.org,
	robh@...nel.org,
	Anders Roxell <anders.roxell@...aro.org>
Subject: [PATCH 2/3] PCI: qcom: Prevent potential error pointer dereference

From: Dan Carpenter <dan.carpenter@...aro.org>

> Only call dev_pm_opp_put() if dev_pm_opp_find_freq_exact() succeeds.
> Otherwise it leads to an error pointer dereference.
> 
> Fixes: 78b5f6f8855e ("PCI: qcom: Add OPP support to scale performance")
> Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>

Tested-by: Anders Roxell <anders.roxell@...aro.org>

Applied this patch ontop of linux-next tag, next-20240709.

Booted fine on dragonboard-845c HW.

Cheers,
Anders

> ---
>  drivers/pci/controller/dwc/pcie-qcom.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
> index 1d36311f9adb..e06c4ad3a72a 100644
> --- a/drivers/pci/controller/dwc/pcie-qcom.c
> +++ b/drivers/pci/controller/dwc/pcie-qcom.c
> @@ -1443,8 +1443,8 @@ static void qcom_pcie_icc_opp_update(struct qcom_pcie *pcie)
>  			if (ret)
>  				dev_err(pci->dev, "Failed to set OPP for freq (%lu): %d\n",
>  					freq_kbps * width, ret);
> +			dev_pm_opp_put(opp);
>  		}
> -		dev_pm_opp_put(opp);
>  	}
>  }
>  
> -- 
> 2.43.0