linux-kernel - Re: [PATCH v3] PCI: of: Fix memory leak when of_changeset_create

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Date:   Fri, 29 Sep 2023 19:18:24 +0200
From:   Herve Codina <herve.codina@...tlin.com>
To:     Lizhi Hou <lizhi.hou@....com>
Cc:     <linux-pci@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <Jonathan.Cameron@...wei.com>,
        <bhelgaas@...gle.com>, <robh@...nel.org>
Subject: Re: [PATCH v3] PCI: of: Fix memory leak when
 of_changeset_create_node() failed

Hi Lizhi,

On Fri, 29 Sep 2023 10:10:17 -0700
Lizhi Hou <lizhi.hou@....com> wrote:

> In function of_pci_make_dev_node(), the cset needs to be destroyed and
> freed when of_changeset_create_node() returns null.
> 
> Fixes: 407d1a51921e ("PCI: Create device tree node for bridge")
> Reported-by: Herve Codina <herve.codina@...tlin.com>
> Closes: https://lore.kernel.org/all/20230911171319.495bb837@bootlin.com/
> Signed-off-by: Lizhi Hou <lizhi.hou@....com>
> ---
>  drivers/pci/of.c | 19 +++++++++++--------
>  1 file changed, 11 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/pci/of.c b/drivers/pci/of.c
> index 2af64bcb7da3..51e3dd0ea5ab 100644
> --- a/drivers/pci/of.c
> +++ b/drivers/pci/of.c
> @@ -657,30 +657,33 @@ void of_pci_make_dev_node(struct pci_dev *pdev)
>  
>  	cset = kmalloc(sizeof(*cset), GFP_KERNEL);
>  	if (!cset)
> -		goto failed;
> +		goto out_free_name;
>  	of_changeset_init(cset);
>  
>  	np = of_changeset_create_node(cset, ppnode, name);
>  	if (!np)
> -		goto failed;
> -	np->data = cset;
> +		goto out_destroy_cset;
>  
>  	ret = of_pci_add_properties(pdev, cset, np);
>  	if (ret)
> -		goto failed;
> +		goto out_free_node;
>  
>  	ret = of_changeset_apply(cset);
>  	if (ret)
> -		goto failed;
> +		goto out_free_node;
>  
> +	np->data = cset;
>  	pdev->dev.of_node = np;
>  	kfree(name);
>  
>  	return;
>  
> -failed:
> -	if (np)
> -		of_node_put(np);
> +out_free_node:
> +	of_node_put(np);
> +out_destroy_cset:
> +	of_changeset_destroy(cset);
> +	kfree(cset);
> +out_free_name:
>  	kfree(name);
>  }
>  #endif

Reviewed-by: Herve Codina <herve.codina@...tlin.com>

Best regards,
Hervé