diff
--- a/vmbus.c
+++ b/vmbus.c
@@ -6,6 +6,7 @@
 4 	if (channel->ringbuffer_page) {
 5 		__free_pages(channel->ringbuffer_page, ...); 
 6         // VULNERABILITY: Accessing freed memory
+7         channel->ringbuffer_page = NULL; // Invalidate the pointer
 8         memset(channel->ringbuffer_page, 0, PAGE_SIZE); // Or any operation 
 9 	}
 10 }

