From 57d3b0308cb6a1a4f0858757e716963afdef27aa Mon Sep 17 00:00:00 2001
From: BoB13-Matter <bob13wtm@gmail.com>
Date: Fri, 20 Dec 2024 18:02:01 +0900
Subject: [PATCH] Add nullptr check for String TLV data with zero length

---
 src/lib/support/BufferWriter.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/lib/support/BufferWriter.cpp b/src/lib/support/BufferWriter.cpp
index 2ba03e22d24e03..5bbe5a5e722633 100644
--- a/src/lib/support/BufferWriter.cpp
+++ b/src/lib/support/BufferWriter.cpp
@@ -30,7 +30,7 @@ BufferWriter & BufferWriter::Put(const void * buf, size_t len)
 {
     size_t available = Available();
 
-    if (available > 0)
+    if (available > 0 && buf != nullptr)
     {
         memmove(mBuf + mNeeded, buf, available < len ? available : len);
     }