KVM: Correct kvm_init() error paths not freeing bad_pge.

Signed-off-by: Zhang Xiantao <xiantao.zhang@intel.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>

drivers/kvm/kvm_main.c

@@ -1311,7 +1311,7 @@ int kvm_init(void *opaque, unsigned int vcpu_size,
 
 	r = kvm_arch_init(opaque);
 	if (r)
-		goto out4;
+		goto out_fail;
 
 	bad_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
 
@@ -1322,37 +1322,37 @@ int kvm_init(void *opaque, unsigned int vcpu_size,
 
 	r = kvm_arch_hardware_setup();
 	if (r < 0)
-		goto out;
+		goto out_free_0;
 
 	for_each_online_cpu(cpu) {
 		smp_call_function_single(cpu,
 				kvm_arch_check_processor_compat,
 				&r, 0, 1);
 		if (r < 0)
-			goto out_free_0;
+			goto out_free_1;
 	}
 
 	on_each_cpu(hardware_enable, NULL, 0, 1);
 	r = register_cpu_notifier(&kvm_cpu_notifier);
 	if (r)
-		goto out_free_1;
+		goto out_free_2;
 	register_reboot_notifier(&kvm_reboot_notifier);
 
 	r = sysdev_class_register(&kvm_sysdev_class);
 	if (r)
-		goto out_free_2;
+		goto out_free_3;
 
 	r = sysdev_register(&kvm_sysdev);
 	if (r)
-		goto out_free_3;
+		goto out_free_4;
 
 	/* A kmem cache lets us meet the alignment requirements of fx_save. */
 	kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size,
 					   __alignof__(struct kvm_vcpu),
 					   0, NULL);
 	if (!kvm_vcpu_cache) {
 		r = -ENOMEM;
-		goto out_free_4;
+		goto out_free_5;
 	}
 
 	kvm_chardev_ops.owner = module;
@@ -1370,21 +1370,23 @@ int kvm_init(void *opaque, unsigned int vcpu_size,
 
 out_free:
 	kmem_cache_destroy(kvm_vcpu_cache);
-out_free_4:
+out_free_5:
 	sysdev_unregister(&kvm_sysdev);
-out_free_3:
+out_free_4:
 	sysdev_class_unregister(&kvm_sysdev_class);
-out_free_2:
+out_free_3:
 	unregister_reboot_notifier(&kvm_reboot_notifier);
 	unregister_cpu_notifier(&kvm_cpu_notifier);
-out_free_1:
+out_free_2:
 	on_each_cpu(hardware_disable, NULL, 0, 1);
-out_free_0:
+out_free_1:
 	kvm_arch_hardware_unsetup();
+out_free_0:
+	__free_page(bad_page);
 out:
 	kvm_arch_exit();
 	kvm_exit_debug();
-out4:
+out_fail:
 	return r;
 }
 EXPORT_SYMBOL_GPL(kvm_init);