QLocalSocket/Win: fix possible UB in _q_pipeClosed()

We must stop the pipe writer before closing the handle on which it
operates.

Change-Id: I4765dd8393167fe2453653aba76a097b8ace8e3d
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@gmx.de>
(cherry picked from commit 64f02ebf05d88eaa8399a5cff85db5a605ede62e)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

1 files changed, 2 insertions, 5 deletions

diff --git a/src/network/socket/qlocalsocket_win.cpp b/src/network/socket/qlocalsocket_win.cpp
index ecaea154df..66705bf998 100644
--- a/src/network/socket/qlocalsocket_win.cpp
+++ b/src/network/socket/qlocalsocket_win.cpp
@@ -255,13 +255,10 @@ void QLocalSocketPrivate::_q_pipeClosed()
     emit q->disconnected();
 
     pipeReader->stop();
+    delete pipeWriter;
+    pipeWriter = nullptr;
     destroyPipeHandles();
     handle = INVALID_HANDLE_VALUE;
-
-    if (pipeWriter) {
-        delete pipeWriter;
-        pipeWriter = 0;
-    }
 }
 
 qint64 QLocalSocket::bytesAvailable() const