From 0ff3c1c34d408ba289edaa2364af2d22c966c5cd Mon Sep 17 00:00:00 2001
From: Sergey Bugaev <bugaevc@serenityos.org>
Date: Fri, 12 Jun 2020 16:44:17 +0300
Subject: [PATCH] AK: Assert refcount doesn't overflow

We don't really have a good way to prevent this kind of overflow,
but let's at least immediately panic in this case.
---
 AK/RefCounted.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/AK/RefCounted.h b/AK/RefCounted.h
index d221e3f5dd..1c010fa162 100644
--- a/AK/RefCounted.h
+++ b/AK/RefCounted.h
@@ -28,6 +28,7 @@
 
 #include <AK/Assertions.h>
 #include <AK/Atomic.h>
+#include <AK/Checked.h>
 #include <AK/Platform.h>
 #include <AK/StdLibExtras.h>
 
@@ -65,6 +66,7 @@ public:
     {
         auto old_ref_count = m_ref_count++;
         ASSERT(old_ref_count > 0);
+        ASSERT(!Checked<RefCountType>::addition_would_overflow(old_ref_count, 1));
     }
 
     ALWAYS_INLINE RefCountType ref_count() const