linux-kernel - Re: [PATCH v4 1/2] irqchip/gic-v3-its: Fix double free on error

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Date: Sat, 13 Apr 2024 09:44:42 +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 v4 1/2] irqchip/gic-v3-its: Fix double free on error

On Sat, 13 Apr 2024 07:40:50 +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.
> 
> Signed-off-by: Guanrui Huang <guanrui.huang@...ux.alibaba.com>
> ---
>  drivers/irqchip/irq-gic-v3-its.c | 9 ++-------
>  1 file changed, 2 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
> index fca888b36680..2305f6b524a9 100644
> --- a/drivers/irqchip/irq-gic-v3-its.c
> +++ b/drivers/irqchip/irq-gic-v3-its.c
> @@ -4561,13 +4561,8 @@ 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;
>  }

Reviewed-by: Marc Zyngier <maz@...nel.org>

	M.

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