Based on the provided code and the specified vulnerability (CWE-457: ) around line 74, here are five possible patches to address the issue:

Patch 1:
```
72 	ret |= set_memory_decrypted((unsigned long)
73 				vmbus_connection.monitor_pages[1], 1);
74 	if (ret) {
75 		vmbus_connection.monitor_pages[0] = NULL;
76 		vmbus_connection.monitor_pages[1] = NULL;
77 		goto cleanup;
78 	}
```

Patch 2:
```
72 	ret |= set_memory_decrypted((unsigned long)
73 				vmbus_connection.monitor_pages[1], 1);
74 	if (ret) {
75 		hv_free_hyperv_page(vmbus_connection.monitor_pages[0]);
76 		hv_free_hyperv_page(vmbus_connection.monitor_pages[1]);
77 		vmbus_connection.monitor_pages[0] = NULL;
78 		vmbus_connection.monitor_pages[1] = NULL;
79 		goto cleanup;
80 	}
```

Patch 3:
```
72 	ret |= set_memory_decrypted((unsigned long)
73 				vmbus_connection.monitor_pages[1], 1);
74 	if (ret) {
75 		set_memory_encrypted((unsigned long)vmbus_connection.monitor_pages[0], 1);
76 		set_memory_encrypted((unsigned long)vmbus_connection.monitor_pages[1], 1);
77 		goto cleanup;
78 	}
```

Patch 4:
```
72 	ret |= set_memory_decrypted((unsigned long)
73 				vmbus_connection.monitor_pages[1], 1);
74 	if (ret) {
75 		vmbus_connection.monitor_pages[0] = NULL;
76 		vmbus_connection.monitor_pages[1] = NULL;
77 		ret = -ENOMEM;
78 		goto cleanup;
79 	}
```

Patch 5:
```
72 	ret |= set_memory_decrypted((unsigned long)
73 				vmbus_connection.monitor_pages[1], 1);
74 	if (ret) {
75 		hv_free_hyperv_page(vmbus_connection.monitor_pages[0]);
76 		hv_free_hyperv_page(vmbus_connection.monitor_pages[1]);
77 		vmbus_connection.monitor_pages[0] = NULL;
78 		vmbus_connection.monitor_pages[1] = NULL;
79 		ret = -EFAULT;
80 		goto cleanup;
81 	}
```

These patches aim to prevent potential use-after-free issues by properly handling the allocated memory and setting appropriate error codes before jumping to the cleanup section.