linux-kernel - Re: [PATCH 1/3] PCI: tegra: Fix OF node reference leak

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Date:   Mon, 5 Jul 2021 22:30:46 +0530
From:   Vidya Sagar <vidyas@...dia.com>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        <thierry.reding@...il.com>, <lorenzo.pieralisi@....com>,
        <robh@...nel.org>, <bhelgaas@...gle.com>, <jonathanh@...dia.com>
CC:     <linux-tegra@...r.kernel.org>, <linux-pci@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <kernel-janitors@...r.kernel.org>
Subject: Re: [PATCH 1/3] PCI: tegra: Fix OF node reference leak

Reviewed-by: Vidya Sagar <vidyas@...dia.com>

On 5/4/2021 10:47 PM, Christophe JAILLET wrote:
> Commit 9e38e690ace3 ("PCI: tegra: Fix OF node reference leak") has fixed
> some node reference leaks in this function but missed some of them.
> 
> In fact, having 'port' referenced in the 'rp' structure is not enough to
> prevent the leak, until 'rp' is actually added in the 'pcie->ports' list.
> 
> Add the missing 'goto err_node_put' accordingly.
> 
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> ---
>   drivers/pci/controller/pci-tegra.c | 13 ++++++++-----
>   1 file changed, 8 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/pci/controller/pci-tegra.c b/drivers/pci/controller/pci-tegra.c
> index 8069bd9232d4..006bf0346dec 100644
> --- a/drivers/pci/controller/pci-tegra.c
> +++ b/drivers/pci/controller/pci-tegra.c
> @@ -2193,13 +2193,15 @@ static int tegra_pcie_parse_dt(struct tegra_pcie *pcie)
>   		rp->np = port;
>   
>   		rp->base = devm_pci_remap_cfg_resource(dev, &rp->regs);
> -		if (IS_ERR(rp->base))
> -			return PTR_ERR(rp->base);
> +		if (IS_ERR(rp->base)) {
> +			err = PTR_ERR(rp->base);
> +			goto err_node_put;
> +		}
>   
>   		label = devm_kasprintf(dev, GFP_KERNEL, "pex-reset-%u", index);
>   		if (!label) {
> -			dev_err(dev, "failed to create reset GPIO label\n");
> -			return -ENOMEM;
> +			err = -ENOMEM;
> +			goto err_node_put;
>   		}
>   
>   		/*
> @@ -2217,7 +2219,8 @@ static int tegra_pcie_parse_dt(struct tegra_pcie *pcie)
>   			} else {
>   				dev_err(dev, "failed to get reset GPIO: %ld\n",
>   					PTR_ERR(rp->reset_gpio));
> -				return PTR_ERR(rp->reset_gpio);
> +				err = PTR_ERR(rp->reset_gpio);
> +				goto err_node_put;
>   			}
>   		}
>   
>