From 26a865f4aa8e66a6d94958de7656f7f1b03c6c56 Mon Sep 17 00:00:00 2001 From: Marcelo Tosatti Date: Fri, 3 Jan 2014 17:00:51 -0200 Subject: [PATCH 1/1] KVM: VMX: fix use after free of vmx->loaded_vmcs After free_loaded_vmcs executes, the "loaded_vmcs" structure is kfreed, and now vmx->loaded_vmcs points to a kfreed area. Subsequent free_loaded_vmcs then attempts to manipulate vmx->loaded_vmcs. Switch the order to avoid the problem. https://bugzilla.redhat.com/show_bug.cgi?id=1047892 Reviewed-by: Jan Kiszka Signed-off-by: Marcelo Tosatti --- arch/x86/kvm/vmx.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index 0abf8b783f19..7661eb171936 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -7390,8 +7390,8 @@ static void vmx_free_vcpu(struct kvm_vcpu *vcpu) struct vcpu_vmx *vmx = to_vmx(vcpu); free_vpid(vmx); - free_nested(vmx); free_loaded_vmcs(vmx->loaded_vmcs); + free_nested(vmx); kfree(vmx->guest_msrs); kvm_vcpu_uninit(vcpu); kmem_cache_free(kvm_vcpu_cache, vmx); -- 2.39.2