linux-kernel - Re: [PATCH] KVM: vgic: Fix potential double free dist->spis in __kvm_vgic

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Message-ID: <c786fec1d39fc8beae4bc4fe4269add9@www.loen.fr>
Date:   Fri, 06 Dec 2019 11:53:36 +0000
From:   Marc Zyngier <maz@...nel.org>
To:     linmiaohe <linmiaohe@...wei.com>
Cc:     <pbonzini@...hat.com>, <rkrcmar@...hat.com>, <james.morse@....com>,
        <julien.thierry.kdev@...il.com>, <suzuki.poulose@....com>,
        <christoffer.dall@....com>, <catalin.marinas@....com>,
        <eric.auger@...hat.com>, <gregkh@...uxfoundation.org>,
        <will@...nel.org>, <andre.przywara@....com>, <tglx@...utronix.de>,
        <linux-arm-kernel@...ts.infradead.org>,
        <kvmarm@...ts.cs.columbia.edu>, <linux-kernel@...r.kernel.org>,
        <kvm@...r.kernel.org>
Subject: Re: [PATCH] KVM: vgic: Fix potential double free dist->spis in  __kvm_vgic_destroy()

On 2019-11-28 06:38, linmiaohe wrote:
> From: Miaohe Lin <linmiaohe@...wei.com>
>
> In kvm_vgic_dist_init() called from kvm_vgic_map_resources(), if
> dist->vgic_model is invalid, dist->spis will be freed without set
> dist->spis = NULL. And in vgicv2 resources clean up path,
> __kvm_vgic_destroy() will be called to free allocated resources.
> And dist->spis will be freed again in clean up chain because we
> forget to set dist->spis = NULL in kvm_vgic_dist_init() failed
> path. So double free would happen.
>
> Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
> ---
>  virt/kvm/arm/vgic/vgic-init.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/virt/kvm/arm/vgic/vgic-init.c 
> b/virt/kvm/arm/vgic/vgic-init.c
> index 53e3969dfb52..c17c29beeb72 100644
> --- a/virt/kvm/arm/vgic/vgic-init.c
> +++ b/virt/kvm/arm/vgic/vgic-init.c
> @@ -171,6 +171,7 @@ static int kvm_vgic_dist_init(struct kvm *kvm,
> unsigned int nr_spis)
>  			break;
>  		default:
>  			kfree(dist->spis);
> +			dist->spis = NULL;
>  			return -EINVAL;
>  		}
>  	}

Applied, thanks.

         M.
-- 
Jazz is not dead. It just smells funny...