linux-kernel - Re: [PATCH 1/2] irqchip/loongson-eiointc: Check hwirq overflow

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Message-ID: <87r11xbxox.wl-maz@kernel.org>
Date:   Wed, 03 Aug 2022 08:20:14 +0100
From:   Marc Zyngier <maz@...nel.org>
To:     Huacai Chen <chenhuacai@...ngson.cn>
Cc:     Thomas Gleixner <tglx@...utronix.de>, loongarch@...ts.linux.dev,
        linux-kernel@...r.kernel.org, Xuefeng Li <lixuefeng@...ngson.cn>,
        Huacai Chen <chenhuacai@...il.com>,
        Jiaxun Yang <jiaxun.yang@...goat.com>
Subject: Re: [PATCH 1/2] irqchip/loongson-eiointc: Check hwirq overflow

On Wed, 03 Aug 2022 05:27:27 +0100,
Huacai Chen <chenhuacai@...ngson.cn> wrote:
> 
> Check hwirq overflow when allocate irq in eiointc domain.
> 
> Signed-off-by: Huacai Chen <chenhuacai@...ngson.cn>
> ---
>  drivers/irqchip/irq-loongson-eiointc.c | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/irqchip/irq-loongson-eiointc.c b/drivers/irqchip/irq-loongson-eiointc.c
> index 80d8ca6f2d46..f8060e58ee06 100644
> --- a/drivers/irqchip/irq-loongson-eiointc.c
> +++ b/drivers/irqchip/irq-loongson-eiointc.c
> @@ -241,8 +241,11 @@ static int eiointc_domain_alloc(struct irq_domain *domain, unsigned int virq,
>  	struct eiointc *priv = domain->host_data;
>  
>  	ret = irq_domain_translate_onecell(domain, arg, &hwirq, &type);
> -	if (ret)
> -		return ret;
> +	if (ret < 0)
> +		return -EINVAL;
> +
> +	if (hwirq >= IOCSR_EXTIOI_VECTOR_NUM)
> +		return -EINVAL;

How can this happen? Also, you're allocating a *range*. Surely the
upper boundary should matter too?

And for the umpteenth time, please add a cover letter when sending
multiple patches. This is a hard requirement for me.

Thanks,

	M.

-- 
Without deviation from the norm, progress is not possible.