linux-kernel - [PATCH 4.9 054/116] KVM: PPC: Book3S HV: Uninit vCPU if vcore creation fails

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Message-Id: <20200213151903.928016018@linuxfoundation.org>
Date:   Thu, 13 Feb 2020 07:19:58 -0800
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Greg Kurz <groug@...d.org>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Paul Mackerras <paulus@...abs.org>,
        Paolo Bonzini <pbonzini@...hat.com>
Subject: [PATCH 4.9 054/116] KVM: PPC: Book3S HV: Uninit vCPU if vcore creation fails

From: Sean Christopherson <sean.j.christopherson@...el.com>

commit 1a978d9d3e72ddfa40ac60d26301b154247ee0bc upstream.

Call kvm_vcpu_uninit() if vcore creation fails to avoid leaking any
resources allocated by kvm_vcpu_init(), i.e. the vcpu->run page.

Fixes: 371fefd6f2dc4 ("KVM: PPC: Allow book3s_hv guests to use SMT processor modes")
Cc: stable@...r.kernel.org
Reviewed-by: Greg Kurz <groug@...d.org>
Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.com>
Acked-by: Paul Mackerras <paulus@...abs.org>
Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/powerpc/kvm/book3s_hv.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -1766,7 +1766,7 @@ static struct kvm_vcpu *kvmppc_core_vcpu
 	mutex_unlock(&kvm->lock);
 
 	if (!vcore)
-		goto free_vcpu;
+		goto uninit_vcpu;
 
 	spin_lock(&vcore->lock);
 	++vcore->num_threads;
@@ -1782,6 +1782,8 @@ static struct kvm_vcpu *kvmppc_core_vcpu
 
 	return vcpu;
 
+uninit_vcpu:
+	kvm_vcpu_uninit(vcpu);
 free_vcpu:
 	kmem_cache_free(kvm_vcpu_cache, vcpu);
 out: