From 4ffcfe7c2a8a977c0b4a1f044bf9384260967a27 Mon Sep 17 00:00:00 2001
From: Vladislav Vaintroub <wlad@mariadb.com>
Date: Sat, 4 Sep 2021 18:52:10 +0200
Subject: [PATCH] MDEV-26538 Incorrect error condition check for ReadFile
 (named pipes)

---
 sql/threadpool_winsockets.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sql/threadpool_winsockets.cc b/sql/threadpool_winsockets.cc
index 6b4758a451f..41167781283 100644
--- a/sql/threadpool_winsockets.cc
+++ b/sql/threadpool_winsockets.cc
@@ -201,7 +201,7 @@ DWORD win_aiosocket::begin_read()
   else
   {
     /* Do async read (named pipe) */
-    if (ReadFile(m_handle, buf.buf, buf.len, 0, &m_overlapped))
+    if (!ReadFile(m_handle, buf.buf, buf.len, 0, &m_overlapped))
       err= GetLastError();
   }