linux-kernel - Re: [PATCH] irqchip/gic-v3-its: Fix potential vpe leak

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Date:   Wed, 22 Sep 2021 09:17:44 +0800
From:   Kaige Fu <kaige.fu@...ux.alibaba.com>
To:     linux-kernel@...r.kernel.org
Cc:     tglx@...utronix.de, maz@...nel.org, shannon.zhao@...ux.alibaba.com
Subject: Re: [PATCH] irqchip/gic-v3-its: Fix potential vpe leak

Ping ...

在 2021/9/15 上午10:20, Kaige Fu 写道:
> In its_vpe_irq_domain_alloc, when there is error calling its_vpe_init
> with vm->vpes[i], it says that the number of vpes which has been
> initialized are 'i'. So, the correct value passed to
> its_vpe_irq_domain_free should be 'i' instead of 'i - 1' because
> its_vpe_irq_domain_free takes nr_irqs as its third parameter.
> 
> If we pass the 'i - 1' to its_vpe_irq_domain_free, the vpe[i - 1] will
> be leaked. This patch fixes it.
> 
> Fixes: 7d75bbb4bc1a ("irqchip/gic-v3-its: Add VPE irq domain allocation/teardown")
> Signed-off-by: Kaige Fu <kaige.fu@...ux.alibaba.com>
> ---
>   drivers/irqchip/irq-gic-v3-its.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
> index 7f40dca8cda5..eb0882d15366 100644
> --- a/drivers/irqchip/irq-gic-v3-its.c
> +++ b/drivers/irqchip/irq-gic-v3-its.c
> @@ -4501,7 +4501,7 @@ static int its_vpe_irq_domain_alloc(struct irq_domain *domain, unsigned int virq
>   
>   	if (err) {
>   		if (i > 0)
> -			its_vpe_irq_domain_free(domain, virq, i - 1);
> +			its_vpe_irq_domain_free(domain, virq, i);
>   
>   		its_lpi_free(bitmap, base, nr_ids);
>   		its_free_prop_table(vprop_page);
>