diff --git a/drivers/oprofile/cpu_buffer.c b/drivers/oprofile/cpu_buffer.c
index 2450b3a393ff..7ba78e6d210e 100644
--- a/drivers/oprofile/cpu_buffer.c
+++ b/drivers/oprofile/cpu_buffer.c
@@ -38,8 +38,10 @@ void free_cpu_buffers(void)
 {
 	int i;
  
-	for_each_online_cpu(i)
+	for_each_online_cpu(i) {
 		vfree(per_cpu(cpu_buffer, i).buffer);
+		per_cpu(cpu_buffer, i).buffer = NULL;
+	}
 }
 
 int alloc_cpu_buffers(void)
diff --git a/drivers/oprofile/event_buffer.c b/drivers/oprofile/event_buffer.c
index e7fbac529935..8d692a5c8e73 100644
--- a/drivers/oprofile/event_buffer.c
+++ b/drivers/oprofile/event_buffer.c
@@ -93,6 +93,8 @@ int alloc_event_buffer(void)
 void free_event_buffer(void)
 {
 	vfree(event_buffer);
+
+	event_buffer = NULL;
 }