linux-kernel - Re: [PATCH] irqchip/sifive-plic: Fix error handling of of_property_read

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Message-ID: <0a1e9afc-e999-451f-8d4f-670f7c15e609@ghiti.fr>
Date: Fri, 22 Mar 2024 18:08:55 +0100
From: Alexandre Ghiti <alex@...ti.fr>
To: Qingfang Deng <dqfext@...il.com>, Thomas Gleixner <tglx@...utronix.de>,
 Palmer Dabbelt <palmer@...belt.com>, Paul Walmsley
 <paul.walmsley@...ive.com>, Albert Ou <aou@...s.berkeley.edu>,
 Atish Patra <atishp@...shpatra.org>, linux-kernel@...r.kernel.org,
 linux-riscv@...ts.infradead.org
Cc: Christoph Hellwig <hch@....de>,
 Qingfang Deng <qingfang.deng@...lower.com.cn>
Subject: Re: [PATCH] irqchip/sifive-plic: Fix error handling of
 of_property_read_u32

Hi Qingfang,

On 22/03/2024 10:00, Qingfang Deng wrote:
> From: Qingfang Deng <qingfang.deng@...lower.com.cn>
>
> nr_irqs will not be initialized if of_property_read_u32 returns an
> error. Check the error first.
>
> Fixes: 8237f8bc4f6e ("irqchip: add a SiFive PLIC driver")
> Signed-off-by: Qingfang Deng <qingfang.deng@...lower.com.cn>
> ---
>   drivers/irqchip/irq-sifive-plic.c | 5 ++++-
>   1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/irqchip/irq-sifive-plic.c b/drivers/irqchip/irq-sifive-plic.c
> index 5b7bc4fd9517..f436b61d74b0 100644
> --- a/drivers/irqchip/irq-sifive-plic.c
> +++ b/drivers/irqchip/irq-sifive-plic.c
> @@ -428,8 +428,11 @@ static int __init __plic_init(struct device_node *node,
>   		goto out_free_priv;
>   	}
>   
> +	error = of_property_read_u32(node, "riscv,ndev", &nr_irqs);
> +	if (error)
> +		goto out_iounmap;
> +
>   	error = -EINVAL;
> -	of_property_read_u32(node, "riscv,ndev", &nr_irqs);
>   	if (WARN_ON(!nr_irqs))
>   		goto out_iounmap;
>   


You can add:

Reviewed-by: Alexandre Ghiti <alexghiti@...osinc.com>

Thanks,

Alex