linux-kernel - Re: [PATCH] irqchip: mips-gic: check the return value of ioremap() in gic_of

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Date:   Fri, 22 Jul 2022 10:21:25 +0100
From:   Marc Zyngier <maz@...nel.org>
To:     williamsukatube@....com
Cc:     tglx@...utronix.de, linux-mips@...r.kernel.org,
        linux-kernel@...r.kernel.org, tsbogend@...ha.franken.de,
        fancer.lancer@...il.com, William Dean <williamsukatube@...il.com>,
        Hacash Robot <hacashRobot@...tino.com>
Subject: Re: [PATCH] irqchip: mips-gic: check the return value of ioremap() in gic_of_init()

On Fri, 22 Jul 2022 10:10:08 +0100,
williamsukatube@....com wrote:
> 
> From: William Dean <williamsukatube@...il.com>
> 
> The function ioremap() in gic_of_init() can fail, so
> its return value should be checked.
> 
> Fixes: 4bdc0d676a643 ("remove ioremap_nocache and devm_ioremap_nocache")

Erm... No. The issue was definitely there before (just look at the
patch you quote here).

> Reported-by: Hacash Robot <hacashRobot@...tino.com>
> Signed-off-by: William Dean <williamsukatube@...il.com>

If sending from a different address, please add a SoB that matches the
address you are using.

> ---
>  drivers/irqchip/irq-mips-gic.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/irqchip/irq-mips-gic.c b/drivers/irqchip/irq-mips-gic.c
> index ff89b36267dd..a1f6d955794a 100644
> --- a/drivers/irqchip/irq-mips-gic.c
> +++ b/drivers/irqchip/irq-mips-gic.c
> @@ -734,6 +734,10 @@ static int __init gic_of_init(struct device_node *node,
>  	}
>  
>  	mips_gic_base = ioremap(gic_base, gic_len);
> +	if (!mips_gic_base) {
> +		pr_err("Failed to ioremap gic_base\n");
> +		return -ENOMEM;
> +	}
>  
>  	gicconfig = read_gic_config();
>  	gic_shared_intrs = FIELD_GET(GIC_CONFIG_NUMINTERRUPTS, gicconfig);

Thanks,

	M.

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