linux-kernel - Re: [PATCH v2] irqchip/gic-v3-its: Fix double free on error

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Message-ID: <86r0fcrvsz.wl-maz@kernel.org>
Date: Thu, 11 Apr 2024 12:19:24 +0100
From: Marc Zyngier <maz@...nel.org>
To: Guanrui Huang <guanrui.huang@...ux.alibaba.com>
Cc: yuzenghui@...wei.com,
	shannon.zhao@...ux.alibaba.com,
	tglx@...utronix.de,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] irqchip/gic-v3-its: Fix double free on error

On Thu, 11 Apr 2024 11:56:30 +0100,
Guanrui Huang <guanrui.huang@...ux.alibaba.com> wrote:
> 
> In its_vpe_irq_domain_alloc, when its_vpe_init() returns an error
> with i > 0, its_vpe_irq_domain_free may free bitmap and vprop_page,
> and then there is a double free in its_vpe_irq_domain_alloc.
> 
> Fix it by calling its_vpe_irq_domain_free directly, bitmap and
> vprop_page will be freed in this function.
> 
> And check whether its_vm is equal to domain->host_data to make sure
> its_vpe_irq_domain_free handle right its_vm.
> 
> Signed-off-by: Guanrui Huang <guanrui.huang@...ux.alibaba.com>
> ---
>  drivers/irqchip/irq-gic-v3-its.c | 12 +++++-------
>  1 file changed, 5 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
> index fca888b36680..72c44e555c88 100644
> --- a/drivers/irqchip/irq-gic-v3-its.c
> +++ b/drivers/irqchip/irq-gic-v3-its.c
> @@ -4523,6 +4523,9 @@ static int its_vpe_irq_domain_alloc(struct irq_domain *domain, unsigned int virq
>  
>  	BUG_ON(!vm);
>  
> +	if (vm != domain->host_data)
> +		return -EINVAL;
> +

How can this happen?

>  	bitmap = its_lpi_alloc(roundup_pow_of_two(nr_irqs), &base, &nr_ids);
>  	if (!bitmap)
>  		return -ENOMEM;
> @@ -4561,13 +4564,8 @@ static int its_vpe_irq_domain_alloc(struct irq_domain *domain, unsigned int virq
>  		irqd_set_resend_when_in_progress(irq_get_irq_data(virq + i));
>  	}
>  
> -	if (err) {
> -		if (i > 0)
> -			its_vpe_irq_domain_free(domain, virq, i);
> -
> -		its_lpi_free(bitmap, base, nr_ids);
> -		its_free_prop_table(vprop_page);
> -	}
> +	if (err)
> +		its_vpe_irq_domain_free(domain, virq, i);
>  
>  	return err;
>  }

This otherwise looks reasonable.

Thanks,

	M.

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