Fix a crash due to null QHostAddress in the TCP/IP backend

When called in boot phases of embedded devices, host name resolution
can fail, resulting in an assert/crash. Bail out with a warning
instead.

Pick-to: 6.5 6.2 5.15
Fixes: QTBUG-116151
Change-Id: I1d8465bd35ff250d3a4b9dbde53bd6634ae70fc6
Reviewed-by: Brett Stottlemyer <bstottle@ford.com>
(cherry picked from commit 65dbc006c81ccaea6af5f0b1e2425cfdb2158325)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

1 files changed, 9 insertions, 8 deletions

diff --git a/src/remoteobjects/qconnection_tcpip_backend.cpp b/src/remoteobjects/qconnection_tcpip_backend.cpp
index b8f584d..a493c03 100644
--- a/src/remoteobjects/qconnection_tcpip_backend.cpp
+++ b/src/remoteobjects/qconnection_tcpip_backend.cpp
@@ -45,14 +45,15 @@ void TcpClientIo::connectToServer()
 {
     if (isOpen())
         return;
-    QHostAddress address(url().host());
-    if (address.isNull()) {
-        const QList<QHostAddress> addresses = QHostInfo::fromName(url().host()).addresses();
-        Q_ASSERT_X(addresses.size() >= 1, Q_FUNC_INFO, url().toString().toLatin1().data());
-        address = addresses.first();
-    }
-
-    m_socket->connectToHost(address, quint16(url().port()));
+    const QString &host = url().host();
+    QHostAddress address(host);
+    if (address.isNull())
+        address = QHostInfo::fromName(host).addresses().value(0);
+
+    if (address.isNull())
+        qWarning("connectToServer(): Failed to resolve host %s", qUtf8Printable(host));
+    else
+        m_socket->connectToHost(address, url().port());
 }
 
 bool TcpClientIo::isOpen() const