linux-kernel - [PATCH v2 17/50] KVM: arm64: Free hypervisor allocations if vector slot init fails

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Date:   Wed, 30 Nov 2022 23:09:01 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>, Marc Zyngier <maz@...nel.org>,
        Huacai Chen <chenhuacai@...nel.org>,
        Aleksandar Markovic <aleksandar.qemu.devel@...il.com>,
        Anup Patel <anup@...infault.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Janosch Frank <frankja@...ux.ibm.com>,
        Claudio Imbrenda <imbrenda@...ux.ibm.com>,
        Matthew Rosato <mjrosato@...ux.ibm.com>,
        Eric Farman <farman@...ux.ibm.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Paul Durrant <paul@....org>
Cc:     James Morse <james.morse@....com>,
        Alexandru Elisei <alexandru.elisei@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Oliver Upton <oliver.upton@...ux.dev>,
        Atish Patra <atishp@...shpatra.org>,
        David Hildenbrand <david@...hat.com>, kvm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev,
        kvmarm@...ts.cs.columbia.edu, linux-mips@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, kvm-riscv@...ts.infradead.org,
        linux-riscv@...ts.infradead.org, linux-s390@...r.kernel.org,
        linux-kernel@...r.kernel.org, Yuan Yao <yuan.yao@...el.com>,
        Cornelia Huck <cohuck@...hat.com>,
        Isaku Yamahata <isaku.yamahata@...el.com>,
        "Philippe Mathieu-Daudé" <philmd@...aro.org>,
        Fabiano Rosas <farosas@...ux.ibm.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Kai Huang <kai.huang@...el.com>, Chao Gao <chao.gao@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH v2 17/50] KVM: arm64: Free hypervisor allocations if vector
 slot init fails

Teardown hypervisor mode if vector slot setup fails in order to avoid
leaking any allocations done by init_hyp_mode().

Fixes: b881cdce77b4 ("KVM: arm64: Allocate hyp vectors statically")
Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
 arch/arm64/kvm/arm.c | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
index 07f5cef5c33b..fa986ebb4793 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c
@@ -2237,18 +2237,18 @@ int kvm_arch_init(void *opaque)
 	err = kvm_init_vector_slots();
 	if (err) {
 		kvm_err("Cannot initialise vector slots\n");
-		goto out_err;
-	}
-
-	err = init_subsystems();
-	if (err)
 		goto out_hyp;
+	}
+
+	err = init_subsystems();
+	if (err)
+		goto out_subs;
 
 	if (!in_hyp_mode) {
 		err = finalize_hyp_mode();
 		if (err) {
 			kvm_err("Failed to finalize Hyp protection\n");
-			goto out_hyp;
+			goto out_subs;
 		}
 	}
 
@@ -2262,8 +2262,9 @@ int kvm_arch_init(void *opaque)
 
 	return 0;
 
-out_hyp:
+out_subs:
 	hyp_cpu_pm_exit();
+out_hyp:
 	if (!in_hyp_mode)
 		teardown_hyp_mode();
 out_err:
-- 
2.38.1.584.g0f3c55d4c2-goog