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From 0b15df7e9e26a4edfc2277eb3ec7b3d5c58a5dcd Mon Sep 17 00:00:00 2001
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From: Arjen Hiemstra <ahiemstra@heimr.nl>
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Date: Thu, 18 Nov 2021 13:05:30 +0100
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Subject: [PATCH 40/41] Client: Delay deletion of QDrag object until after
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we're done with it
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In certain cases, most notably when performing drag and drop operations
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with touch, the QDrag object gets deleted before data_source_send is
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executed. This then tries to access a deleted data_source, crashing the
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client.
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To avoid this, we indicate we want the QDrag object to stay around and
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then delete it in QWaylandDrag::finishDrag, which with data_device v3 is
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guaranteed to be called after everyone is done with the data source.
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Change-Id: I6a2f5a219f58d1b721a9fec33c57d26d2c522ec9
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Reviewed-by: David Edmundson <davidedmundson@kde.org>
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(cherry picked from commit 39e3290efa2dd40722fa3322284cae3b01ccedf4)
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---
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src/client/qwaylanddnd.cpp | 11 +++++++++++
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src/client/qwaylanddnd_p.h | 1 +
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2 files changed, 12 insertions(+)
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diff --git a/src/client/qwaylanddnd.cpp b/src/client/qwaylanddnd.cpp
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index 97ee5b2e..7c53f5fa 100644
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--- a/src/client/qwaylanddnd.cpp
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+++ b/src/client/qwaylanddnd.cpp
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@@ -80,6 +80,9 @@ void QWaylandDrag::cancel()
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QBasicDrag::cancel();
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m_display->currentInputDevice()->dataDevice()->cancelDrag();
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+
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+ if (drag())
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+ drag()->deleteLater();
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}
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void QWaylandDrag::move(const QPoint &globalPos, Qt::MouseButtons b, Qt::KeyboardModifiers mods)
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@@ -130,6 +133,14 @@ void QWaylandDrag::finishDrag()
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{
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QKeyEvent event(QEvent::KeyPress, Qt::Key_Escape, Qt::NoModifier);
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eventFilter(shapedPixmapWindow(), &event);
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+
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+ if (drag())
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+ drag()->deleteLater();
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+}
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+
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+bool QWaylandDrag::ownsDragObject() const
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+{
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+ return true;
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}
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}
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diff --git a/src/client/qwaylanddnd_p.h b/src/client/qwaylanddnd_p.h
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index 747f0190..46f629ac 100644
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--- a/src/client/qwaylanddnd_p.h
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+++ b/src/client/qwaylanddnd_p.h
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@@ -83,6 +83,7 @@ protected:
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void drop(const QPoint &globalPos, Qt::MouseButtons b, Qt::KeyboardModifiers mods) override;
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void endDrag() override;
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+ bool ownsDragObject() const override;
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private:
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QWaylandDisplay *m_display = nullptr;
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--
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2.34.1
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