Commit 26a865f4 authored Jan 03, 2014 by Marcelo Tosatti

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 <jan.kiszka@siemens.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

parent 96893977

arch/x86/kvm/vmx.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -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);

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