KVM: fix cleanup_srcu_struct use-after-free

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kvm_destroy_vm should free "struct kvm" after cleanup_srcu_struct.

Signed-off-by: Marcelo Tosatti <mtosatti@xxxxxxxxxx>

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index e0a591d..c828a39 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -509,8 +509,8 @@ static void kvm_destroy_vm(struct kvm *kvm)
 #else
 	kvm_arch_flush_shadow(kvm);
 #endif
-	kvm_arch_destroy_vm(kvm);
 	cleanup_srcu_struct(&kvm->srcu);
+	kvm_arch_destroy_vm(kvm);
 	hardware_disable_all();
 	mmdrop(mm);
 }
--
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