From 598d346e8277d4ee1dd57d938eea3a222b040fc5 Mon Sep 17 00:00:00 2001
From: Alexander Grund <Flamefire@users.noreply.github.com>
Date: Tue, 17 Sep 2024 19:57:40 +0200
Subject: [PATCH] Avoid UB in debug code

`std::memset` calls with a nullptr argument are flagged as UB by GCC `-fsanitize=undefined`, so check the size first

Fixes #39
---
 include/boost/circular_buffer/debug.hpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/boost/circular_buffer/debug.hpp b/include/boost/circular_buffer/debug.hpp
index b6ab0fef..27bcbb8f 100644
--- a/include/boost/circular_buffer/debug.hpp
+++ b/include/boost/circular_buffer/debug.hpp
@@ -34,7 +34,8 @@ const int UNINITIALIZED = 0xcc;
 
 template <class T>
 inline void do_fill_uninitialized_memory(T* data, std::size_t size_in_bytes) BOOST_NOEXCEPT {
-    std::memset(static_cast<void*>(data), UNINITIALIZED, size_in_bytes);
+    if(size_in_bytes)
+        std::memset(static_cast<void*>(data), UNINITIALIZED, size_in_bytes);
 }
 
 template <class T>