From d88ded29d968b8ccf41d4dffa73c3f8f030a9f5d Mon Sep 17 00:00:00 2001
From: Alex Trotsenko <alex1973tr@gmail.com>
Date: Tue, 25 Apr 2017 19:28:04 +0300
Subject: Fix possible UB in ReadFile()

This patch replicates commit 225ef1baeb0e49f157f3ba1271915e623bd27dd9
for Windows.

Change-Id: Ic4e3444183289e7ce1a487500633fb5ad95590b9
Reviewed-by: Denis Shienkov <denis.shienkov@gmail.com>
---
 src/serialport/qserialport_win.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/serialport/qserialport_win.cpp b/src/serialport/qserialport_win.cpp
index 84bf5b9..0494889 100644
--- a/src/serialport/qserialport_win.cpp
+++ b/src/serialport/qserialport_win.cpp
@@ -545,7 +545,7 @@ bool QSerialPortPrivate::startAsyncRead()
 
     if (readBufferMaxSize && bytesToRead > (readBufferMaxSize - buffer.size())) {
         bytesToRead = readBufferMaxSize - buffer.size();
-        if (bytesToRead == 0) {
+        if (bytesToRead <= 0) {
             // Buffer is full. User must read data from the buffer
             // before we can read more from the port.
             return false;
-- 
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