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

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Message-ID: <20210622104145.GA24565@lpieralisi>
Date:   Tue, 22 Jun 2021 11:42:10 +0100
From:   Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        thierry.reding@...il.com
Cc:     robh@...nel.org, bhelgaas@...gle.com, jonathanh@...dia.com,
        linux-tegra@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        vidyas@...dia.com
Subject: Re: [PATCH 1/3] PCI: tegra: Fix OF node reference leak

On Tue, May 04, 2021 at 07:17:42PM +0200, 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(-)

Thierry, Jon, Vidya,

please review this series when you have time, thanks.

Lorenzo

> 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;
>  			}
>  		}
>  
> -- 
> 2.30.2
>