QAbstractItemView: don't access invalid indexes on copy-key

When pressing the copy key the view tried to access the model's data for
the currentIndex() without checking whether the index is valid. This
resulted in debug output to the console, and might break models that
didn't check incoming indexes for validity (or asserted validity).

Fix this by checking whether the currentIndex() is valid before reading
the model's data for that index.

Fixes: QTBUG-106569
Change-Id: Ide75fbdfdbd1451ab6d48f07b22136553c5b2468
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@qt.io>
(cherry picked from commit 3a0c33da3d913431391c5b7f4f0e93ea9d2221dc)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

1 files changed, 6 insertions, 5 deletions

diff --git a/src/widgets/itemviews/qabstractitemview.cpp b/src/widgets/itemviews/qabstractitemview.cpp
index d7d9a40b3f..f005d4fdc4 100644
--- a/src/widgets/itemviews/qabstractitemview.cpp
+++ b/src/widgets/itemviews/qabstractitemview.cpp
@@ -2366,11 +2366,12 @@ void QAbstractItemView::keyPressEvent(QKeyEvent *event)
 
 #if !defined(QT_NO_CLIPBOARD) && !defined(QT_NO_SHORTCUT)
     if (event == QKeySequence::Copy) {
-        QVariant variant;
-        if (d->model)
-            variant = d->model->data(currentIndex(), Qt::DisplayRole);
-        if (variant.canConvert<QString>())
-            QGuiApplication::clipboard()->setText(variant.toString());
+        const QModelIndex index = currentIndex();
+        if (index.isValid() && d->model) {
+            const QVariant variant = d->model->data(index, Qt::DisplayRole);
+            if (variant.canConvert<QString>())
+                QGuiApplication::clipboard()->setText(variant.toString());
+        }
         event->accept();
     }
 #endif