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

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Message-ID: <bed81abf-cc39-53f0-6b22-33a0c2678142@huawei.com>
Date: Fri, 12 Apr 2024 11:05:43 +0800
From: Zenghui Yu <yuzenghui@...wei.com>
To: Guanrui Huang <guanrui.huang@...ux.alibaba.com>
CC: <maz@...nel.org>, <shannon.zhao@...ux.alibaba.com>, <tglx@...utronix.de>,
	<linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] irqchip/gic-v3-its: Fix double free on error

Hi Guanrui,

On 2024/4/12 10:15, Guanrui Huang 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 | 11 ++---------
>  1 file changed, 2 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
> index fca888b36680..55c83e19719d 100644
> --- a/drivers/irqchip/irq-gic-v3-its.c
> +++ b/drivers/irqchip/irq-gic-v3-its.c
> @@ -4521,8 +4521,6 @@ static int its_vpe_irq_domain_alloc(struct irq_domain *domain, unsigned int virq
>  	struct page *vprop_page;
>  	int base, nr_ids, i, err = 0;
>  
> -	BUG_ON(!vm);
> -

The BUG_ON() is indeed useless, though it'd be better to remove it in a
separate patch, with a commit message explaining why it is not needed.

>  	bitmap = its_lpi_alloc(roundup_pow_of_two(nr_irqs), &base, &nr_ids);
>  	if (!bitmap)
>  		return -ENOMEM;
> @@ -4561,13 +4559,8 @@ 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);

This looks good,

Reviewed-by: Zenghui Yu <yuzenghui@...wei.com>

Thanks for the fix.

Zenghui