linux-kernel - Re: [PATCH v2 02/45] KVM: PPC: Book3S PR: Free shared page if mmu initialization fails

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Date:   Mon, 20 Jan 2020 14:00:41 +1100
From:   Paul Mackerras <paulus@...abs.org>
To:     Sean Christopherson <sean.j.christopherson@...el.com>
Cc:     Marc Zyngier <maz@...nel.org>, James Hogan <jhogan@...nel.org>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Janosch Frank <frankja@...ux.ibm.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        James Morse <james.morse@....com>,
        Julien Thierry <julien.thierry.kdev@...il.com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        David Hildenbrand <david@...hat.com>,
        Cornelia Huck <cohuck@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        linux-mips@...r.kernel.org, kvm-ppc@...r.kernel.org,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Greg Kurz <groug@...d.org>
Subject: Re: [PATCH v2 02/45] KVM: PPC: Book3S PR: Free shared page if mmu
 initialization fails

On Wed, Dec 18, 2019 at 01:54:47PM -0800, Sean Christopherson wrote:
> Explicitly free the shared page if kvmppc_mmu_init() fails during
> kvmppc_core_vcpu_create(), as the page is freed only in
> kvmppc_core_vcpu_free(), which is not reached via kvm_vcpu_uninit().
> 
> Fixes: 96bc451a15329 ("KVM: PPC: Introduce shared page")
> Cc: stable@...r.kernel.org
> Reviewed-by: Greg Kurz <groug@...d.org>
> Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.com>
> ---
>  arch/powerpc/kvm/book3s_pr.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c
> index ce4fcf76e53e..26ca62b6d773 100644
> --- a/arch/powerpc/kvm/book3s_pr.c
> +++ b/arch/powerpc/kvm/book3s_pr.c
> @@ -1806,10 +1806,12 @@ static struct kvm_vcpu *kvmppc_core_vcpu_create_pr(struct kvm *kvm,
>  
>  	err = kvmppc_mmu_init(vcpu);
>  	if (err < 0)
> -		goto uninit_vcpu;
> +		goto free_shared_page;
>  
>  	return vcpu;
>  
> +free_shared_page:
> +	free_page((unsigned long)vcpu->arch.shared);
>  uninit_vcpu:
>  	kvm_vcpu_uninit(vcpu);
>  free_shadow_vcpu:
> -- 
> 2.24.1

Looks correct.

Acked-by: Paul Mackerras <paulus@...abs.org>