A follow-up fix for potentially missing OpenSSL symbol resolving

This patch also adds 'isValid()' to know if a backend from a plugin
is in working condition (say, there is 'openssl' plugin but no or
old openssl libraries in some system).

Task-number: QTBUG-65922
Change-Id: I0b846536a069ca8c5a94e7191f11c81bac6ad527
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
(cherry picked from commit 573ba145d76f239dbc7464a78aabc06ed4d00419)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

1 files changed, 9 insertions, 2 deletions

diff --git a/src/network/ssl/qtlsbackend.cpp b/src/network/ssl/qtlsbackend.cpp
index ac6d965bd3..1df462e362 100644
--- a/src/network/ssl/qtlsbackend.cpp
+++ b/src/network/ssl/qtlsbackend.cpp
@@ -110,8 +110,10 @@ public:
             return names;
 
         names.reserve(backends.size());
-        for (const auto *factory : backends)
-            names.append(factory->backendName());
+        for (const auto *backend : backends) {
+            if (backend->isValid())
+                names.append(backend->backendName());
+        }
 
         return names;
     }
@@ -198,6 +200,11 @@ QTlsBackend::~QTlsBackend()
         backends->removeBackend(this);
 }
 
+bool QTlsBackend::isValid() const
+{
+    return true;
+}
+
 QString QTlsBackend::backendName() const
 {
     return QStringLiteral("dummyTLS");