linux-kernel - Re: [REGRESSION] Re: [patch V3 09/33] genirq/msi: Add range checking to msi_insert

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Message-ID: <87y1osp48j.ffs@tglx>
Date:   Mon, 20 Feb 2023 19:43:24 +0100
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Marc Zyngier <maz@...nel.org>,
        "Russell King (Oracle)" <linux@...linux.org.uk>
Cc:     LKML <linux-kernel@...r.kernel.org>, x86@...nel.org,
        Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        linux-pci@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jason Gunthorpe <jgg@...lanox.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Kevin Tian <kevin.tian@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Logan Gunthorpe <logang@...tatee.com>,
        Ashok Raj <ashok.raj@...el.com>, Jon Mason <jdmason@...zu.us>,
        Allen Hubbe <allenbh@...il.com>
Subject: Re: [REGRESSION] Re: [patch V3 09/33] genirq/msi: Add range
 checking to msi_insert_desc()

On Mon, Feb 20 2023 at 18:29, Marc Zyngier wrote:
> diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c
> index 783a3e6a0b10..13d96495e6d0 100644
> --- a/kernel/irq/msi.c
> +++ b/kernel/irq/msi.c
> @@ -1084,10 +1084,13 @@ int msi_domain_populate_irqs(struct irq_domain *domain, struct device *dev,
>  	struct xarray *xa;
>  	int ret, virq;
>  
> -	if (!msi_ctrl_valid(dev, &ctrl))
> -		return -EINVAL;
> -
>  	msi_lock_descs(dev);
> +
> +	if (!msi_ctrl_valid(dev, &ctrl)) {
> +		ret = -EINVAL;
> +		goto unlock;
> +	}
> +
>  	ret = msi_domain_add_simple_msi_descs(dev, &ctrl);
>  	if (ret)
>  		goto unlock;

Yup, you beat me by a minute :)