linux-kernel - Re: [PATCH] irqchip/gic-v3: fix resource leak in partition_domain

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Message-ID: <20250721101015.1183e89b@bootlin.com>
Date: Mon, 21 Jul 2025 10:10:15 +0200
From: Herve Codina <herve.codina@...tlin.com>
To: jackysliu <1972843537@...com>
Cc: maz@...nel.org, tglx@...utronix.de, antonio.borneo@...s.st.com,
 anup@...infault.org, jirislaby@...nel.org,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] irqchip/gic-v3: fix resource leak in
 partition_domain_translate()

On Mon, 21 Jul 2025 15:28:04 +0800
jackysliu <1972843537@...com> wrote:

> There is a device node reference leak in partition_domain_translate().
> After the function obtains the device node np via of_find_node_by_phandle,
> it does not call of_node_put(np) to release the node reference
> in both the error path and the normal return path.
> This causes the node reference count to increase each time
> the function is called, causing a resource leak.
> 
> This issue was detected by rule based static tools
> developed by Tencent.
> 
> Fixes: 87228532e7e9 ("irqchip: Switch to of_fwnode_handle()")
> 
> Signed-off-by: jackysliu <1972843537@...com>
> ---
>  drivers/irqchip/irq-gic-v3.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c
> index efc791c43d44..61c1d404b726 100644
> --- a/drivers/irqchip/irq-gic-v3.c
> +++ b/drivers/irqchip/irq-gic-v3.c
> @@ -1821,12 +1821,16 @@ static int partition_domain_translate(struct irq_domain *d,
>  		return -EINVAL;
>  
>  	ret = gic_irq_domain_translate(d, fwspec, &ppi_intid, type);
> -	if (WARN_ON_ONCE(ret))
> +	if (WARN_ON_ONCE(ret)) {
> +		of_node_put(np);
>  		return 0;
> +	}
>  
>  	ppi_idx = __gic_get_ppi_index(ppi_intid);
>  	ret = partition_translate_id(gic_data.ppi_descs[ppi_idx],
>  				     of_fwnode_handle(np));
> +	of_node_put(np);
> +
>  	if (ret < 0)
>  		return ret;
>  

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

Best regards,
Hervé