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Date:   Thu, 24 Oct 2019 09:05:27 +0200
From:   Greg Kurz <groug@kaod.org>
To:     Sean Christopherson <sean.j.christopherson@intel.com>
Cc:     Marc Zyngier <maz@kernel.org>, James Hogan <jhogan@kernel.org>,
        Paul Mackerras <paulus@ozlabs.org>,
        Christian Borntraeger <borntraeger@de.ibm.com>,
        Janosch Frank <frankja@linux.ibm.com>,
        Paolo Bonzini <pbonzini@redhat.com>,
        Radim =?UTF-8?B?S3LEjW3DocWZ?= <rkrcmar@redhat.com>,
        James Morse <james.morse@arm.com>,
        Julien Thierry <julien.thierry.kdev@gmail.com>,
        Suzuki K Poulose <suzuki.poulose@arm.com>,
        David Hildenbrand <david@redhat.com>,
        Cornelia Huck <cohuck@redhat.com>,
        Vitaly Kuznetsov <vkuznets@redhat.com>,
        Wanpeng Li <wanpengli@tencent.com>,
        Jim Mattson <jmattson@google.com>,
        Joerg Roedel <joro@8bytes.org>,
        linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu,
        linux-mips@vger.kernel.org, kvm-ppc@vger.kernel.org,
        kvm@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 02/45] KVM: PPC: Book3S PR: Free shared page if mmu
 initialization fails
Message-ID: <20191024090527.6b73a3bc@bahia.lan>
In-Reply-To: <20191022015925.31916-3-sean.j.christopherson@intel.com>
References: <20191022015925.31916-1-sean.j.christopherson@intel.com>
        <20191022015925.31916-3-sean.j.christopherson@intel.com>
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On Mon, 21 Oct 2019 18:58:42 -0700
Sean Christopherson <sean.j.christopherson@intel.com> 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@vger.kernel.org
> Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
> ---

Reviewed-by: Greg Kurz <groug@kaod.org>

>  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 cc65af8fe6f7..3f6ad3f58628 100644
> --- a/arch/powerpc/kvm/book3s_pr.c
> +++ b/arch/powerpc/kvm/book3s_pr.c
> @@ -1769,10 +1769,12 @@ 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: