Fix URL adjustment of URLs with no host

QUrl can have an empty host, but still considered to be valid.
This is possible, for example, when setting an invalid host address or
when the URL is a path. Adjusting such URLs leads to unexpected results.

Added a check for preventing sending requests to URLs with no host.

Fixes: QTBUG-75155
Change-Id: I6c899f824233f32cddb8c9255fd3d1c333bb6385
Reviewed-by: Alex Blasche <alexander.blasche@qt.io>

1 files changed, 5 insertions, 0 deletions

diff --git a/src/coap/qcoaprequest.cpp b/src/coap/qcoaprequest.cpp
index 64e0963..58420ac 100644
--- a/src/coap/qcoaprequest.cpp
+++ b/src/coap/qcoaprequest.cpp
@@ -315,6 +315,11 @@ QUrl QCoapRequest::adjustedUrl(const QUrl &url, bool secure)
         finalizedUrl.setScheme(scheme);
     }
 
+    if (finalizedUrl.host().isEmpty()) {
+        qCWarning(lcCoapExchange) << "The requested URL" << url << "is not a valid CoAP URL.";
+        return QUrl();
+    }
+
     if (url.port() == -1) {
         const auto port = secure ? QtCoap::DefaultSecurePort : QtCoap::DefaultPort;
         finalizedUrl.setPort(port);