linux-kernel - Re: [PATCH] irqchip/tango: Fix possible null ptr reference in tangox_irq

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Date:   Thu, 03 Sep 2020 09:10:16 +0100
From:   Marc Zyngier <maz@...nel.org>
To:     Ye Bin <yebin10@...wei.com>
Cc:     tglx@...utronix.de, jason@...edaemon.net,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] irqchip/tango: Fix possible null ptr reference in
 tangox_irq_init

On 2020-09-03 02:59, Ye Bin wrote:
> In tangox_irq_init allocate chip but not test.
> 
> Signed-off-by: Ye Bin <yebin10@...wei.com>
> ---
>  drivers/irqchip/irq-tango.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/irqchip/irq-tango.c b/drivers/irqchip/irq-tango.c
> index 34290f09b853..25da120230ad 100644
> --- a/drivers/irqchip/irq-tango.c
> +++ b/drivers/irqchip/irq-tango.c
> @@ -187,6 +187,8 @@ static int __init tangox_irq_init(void __iomem
> *base, struct resource *baseres,
>  		panic("%pOFn: failed to get address", node);
> 
>  	chip = kzalloc(sizeof(*chip), GFP_KERNEL);
> +	if (!chip)
> +		panic("%pOFn: failed to get chip", node);
>  	chip->ctl = res.start - baseres->start;
>  	chip->base = base;

So you are trading a panic for a panic? What is the point?
A failing kzalloc already gives you all the information you may
need.

         M.
-- 
Jazz is not dead. It just smells funny...