From 6f1ef95071c00f85df45132dd2c6cd0405835870 Mon Sep 17 00:00:00 2001
From: Abhijeet Patil <abhijeet@neon.tech>
Date: Thu, 11 Jan 2024 10:52:10 +0000
Subject: [PATCH] applied fix for PG16 sanitizers

---
 src/backend/access/transam/xlog.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index 0a6226892c9..3f20356de71 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -1281,7 +1281,8 @@ CopyXLogRecordToWAL(int write_len, bool isLogSwitch, XLogRecData *rdata,
 		}
 
 		Assert(CurrPos % XLOG_BLCKSZ >= SizeOfXLogShortPHD || rdata_len == 0);
-		memcpy(currpos, rdata_data, rdata_len);
+		if (rdata_len > 0)
+			memcpy(currpos, rdata_data, rdata_len);
 		currpos += rdata_len;
 		CurrPos += rdata_len;
 		freespace -= rdata_len;