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From: Jan Kiszka <jan.kiszka@web.de>
To: Paolo Bonzini <pbonzini@redhat.com>, kvm <kvm@vger.kernel.org>
Cc: Liran Alon <liran.alon@oracle.com>
Subject: [PATCH] KVM: nVMX: Set cached_vmcs12 and cached_shadow_vmcs12 NULL after free
Date: Sun, 21 Jul 2019 16:01:36 +0200	[thread overview]
Message-ID: <e48af3c7-c7ac-87b4-3ce1-9b7b775cd6f2@web.de> (raw)

From: Jan Kiszka <jan.kiszka@siemens.com>

Shall help finding use-after-free bugs earlier.

Suggested-by: Liran Alon <liran.alon@oracle.com>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
---
 arch/x86/kvm/vmx/nested.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index 4cdab4b4eff1..ced9fba32598 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -234,7 +234,9 @@ static void free_nested(struct kvm_vcpu *vcpu)
 		vmx->vmcs01.shadow_vmcs = NULL;
 	}
 	kfree(vmx->nested.cached_vmcs12);
+	vmx->nested.cached_vmcs12 = NULL;
 	kfree(vmx->nested.cached_shadow_vmcs12);
+	vmx->nested.cached_shadow_vmcs12 = NULL;
 	/* Unpin physical memory we referred to in the vmcs02 */
 	if (vmx->nested.apic_access_page) {
 		kvm_release_page_dirty(vmx->nested.apic_access_page);
--
2.16.4

             reply	other threads:[~2019-07-21 14:01 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-21 14:01 Jan Kiszka [this message]
2019-07-22 11:50 ` [PATCH] KVM: nVMX: Set cached_vmcs12 and cached_shadow_vmcs12 NULL after free Paolo Bonzini

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