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From 4fe9e0ed027134a833b2243597a2ccd00987b559 Mon Sep 17 00:00:00 2001
From: Piotr Mikolajczyk <piotr.mikolajczyk@qt.io>
Date: Tue, 29 Sep 2020 10:41:23 +0200
Subject: [PATCH] Fix crash when showing Map QML comp. for 2nd+ time
Crash caused by storing pointer to a node that could be deleted elsewhere
Fixes: QTBUG-85260
Change-Id: I871123322fac84b8bf91e9bab8ecad08e75c2854
Reviewed-by: Paolo Angelelli <paolo.angelelli.qt@gmail.com>
---
src/location/labs/qsg/qgeomapobjectqsgsupport.cpp | 29 ++++++++++++++++++++++-
1 file changed, 28 insertions(+), 1 deletion(-)
diff --git a/src/location/labs/qsg/qgeomapobjectqsgsupport.cpp b/src/location/labs/qsg/qgeomapobjectqsgsupport.cpp
index 0e1df8f6c..cd1801305 100644
--- a/src/location/labs/qsg/qgeomapobjectqsgsupport.cpp
+++ b/src/location/labs/qsg/qgeomapobjectqsgsupport.cpp
@@ -48,7 +48,32 @@ static int findMapObject(QGeoMapObject *o, const QList<MapObject> &list)
}
return -1;
}
+namespace {
+bool findNodeInStructure(QSGNode *root, QSGNode *item)
+{
+ if (root == nullptr || item == nullptr)
+ return false;
+ if (root == item)
+ return true;
+ auto currentChild = root->firstChild();
+ // First check the direct child nodes and if not found let's dive deeper
+ bool bFound = (item == currentChild);
+
+ while (!bFound && currentChild) {
+ currentChild = currentChild->nextSibling();
+ bFound = (item == currentChild);
+ }
+ if (!bFound) {
+ currentChild = root->firstChild();
+ while (!bFound && currentChild) {
+ bFound = findNodeInStructure(currentChild, item);
+ currentChild = currentChild->nextSibling();
+ }
+ }
+ return bFound;
+}
+}
bool QGeoMapObjectQSGSupport::createMapObjectImplementation(QGeoMapObject *obj, QGeoMapPrivate *d)
{
QExplicitlySharedDataPointer<QGeoMapObjectPrivate> pimpl =
@@ -157,9 +182,11 @@ void QGeoMapObjectQSGSupport::updateMapObjects(QSGNode *root, QQuickWindow *wind
{
if (!root)
return;
+ if (!findNodeInStructure(root, m_mapObjectsRootNode))
+ m_mapObjectsRootNode = nullptr;
if (!m_mapObjectsRootNode) {
m_mapObjectsRootNode = new QDeclarativePolygonMapItemPrivateOpenGL::RootNode();
- root->appendChildNode(m_mapObjectsRootNode);
+ root->appendChildNode(m_mapObjectsRootNode); // PASSING OWNERSHIP!
}
m_mapObjectsRootNode->removeAllChildNodes();
--
2.16.3
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