boo#1210849
OBS-URL: https://build.opensuse.org/package/show/KDE:Qt6/qt6-base?expand=0&rev=50
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0001-QVariant-Fix-support-for-metatypes-created-by-Qt-6.5.patch
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0001-QVariant-Fix-support-for-metatypes-created-by-Qt-6.5.patch
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From 42c87e932c308c6269c4195091adae24bce90af1 Mon Sep 17 00:00:00 2001
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From: Fabian Kosmale <fabian.kosmale@qt.io>
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Date: Thu, 27 Apr 2023 09:40:17 +0200
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Subject: [PATCH] QVariant: Fix support for metatypes created by Qt < 6.5
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In Qt >= 6.1, < 6.5, a trivially constructible type would have the
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NeedsDestruction flag set, but it's dtor pointer would have been null.
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In Qt 6.5, the meaning of the NeedsDestruction flag was changed to be
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more aligned with what the name suggests, and thus would only be set for
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non-trivially destructible types. For QMetaType this was fine, but
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QVariant has a check for acceptable metatypes which attempts to verify
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whether a QMetaType is usable for QVariant. The check assumes the
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semantics of Qt 6.5, and thus fails for metatypes created by older Qt
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versions.
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To fix this issue, we increment the QMetaType revision field, and only
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check the metatype's destruction support if the revision is high enough.
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In theory, that allows passing unsuitable metatypes from older Qt
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versions to QVariant; however, such code would have been broken in prior
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Qt releases already (which didn't attempt the check), and no code that
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used to work in any released Qt version will break (as we simply skip a
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check that was passing before).
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Fixes: QTBUG-113227
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Pick-to: 6.5
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Change-Id: I12e02bd97d2c410ea1a36efb0ce2389f21d50a30
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Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>
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---
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src/corelib/kernel/qmetatype.h | 11 ++++++--
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src/corelib/kernel/qmetatype_p.h | 7 ++++-
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.../corelib/kernel/qvariant/tst_qvariant.cpp | 28 +++++++++++++++++++
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3 files changed, 43 insertions(+), 3 deletions(-)
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diff --git a/src/corelib/kernel/qmetatype.h b/src/corelib/kernel/qmetatype.h
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index e70f901..a641313 100644
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--- a/src/corelib/kernel/qmetatype.h
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+++ b/src/corelib/kernel/qmetatype.h
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@@ -246,7 +246,14 @@ using NonConstMetaTypeInterface = const QMetaTypeInterface;
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class QMetaTypeInterface
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{
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public:
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- ushort revision; // 0 in Qt 6.0. Can increase if new field are added
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+
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+ /* Revision: Can increase if new field are added, or if semantics changes
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+ 0: Initial Revision
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+ 1: the meaning of the NeedsDestruction flag changed
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+ */
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+ static inline constexpr ushort CurrentRevision = 1;
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+
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+ ushort revision;
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ushort alignment;
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uint size;
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uint flags;
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@@ -2461,7 +2468,7 @@ struct QMetaTypeInterfaceWrapper
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using InterfaceType = std::conditional_t<IsConstMetaTypeInterface, const QMetaTypeInterface, NonConstMetaTypeInterface>;
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static inline InterfaceType metaType = {
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- /*.revision=*/ 0,
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+ /*.revision=*/ QMetaTypeInterface::CurrentRevision,
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/*.alignment=*/ alignof(T),
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/*.size=*/ sizeof(T),
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/*.flags=*/ QMetaTypeForType<T>::Flags,
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diff --git a/src/corelib/kernel/qmetatype_p.h b/src/corelib/kernel/qmetatype_p.h
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index 3defbc7..e649394 100644
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--- a/src/corelib/kernel/qmetatype_p.h
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+++ b/src/corelib/kernel/qmetatype_p.h
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@@ -152,7 +152,12 @@ inline bool isMoveConstructible(const QtPrivate::QMetaTypeInterface *iface) noex
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inline bool isDestructible(const QtPrivate::QMetaTypeInterface *iface) noexcept
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{
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- return checkMetaTypeFlagOrPointer(iface, iface->dtor, QMetaType::NeedsDestruction);
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+ /* For metatypes of revision 1, the NeedsDestruction was set even for trivially
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+ destructible types, but their dtor pointer would be null.
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+ For that reason, we need the additional check here.
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+ */
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+ return iface->revision < 1 ||
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+ checkMetaTypeFlagOrPointer(iface, iface->dtor, QMetaType::NeedsDestruction);
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}
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inline void defaultConstruct(const QtPrivate::QMetaTypeInterface *iface, void *where)
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diff --git a/tests/auto/corelib/kernel/qvariant/tst_qvariant.cpp b/tests/auto/corelib/kernel/qvariant/tst_qvariant.cpp
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index 61a8e76..9dfc143 100644
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--- a/tests/auto/corelib/kernel/qvariant/tst_qvariant.cpp
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+++ b/tests/auto/corelib/kernel/qvariant/tst_qvariant.cpp
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@@ -331,6 +331,7 @@ private slots:
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void constructFromIncompatibleMetaType_data();
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void constructFromIncompatibleMetaType();
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+ void constructFromQtLT65MetaType();
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void copyNonDefaultConstructible();
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private:
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@@ -5636,6 +5637,33 @@ void tst_QVariant::constructFromIncompatibleMetaType()
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QVERIFY(!QVariant(regular).convert(type));
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}
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+void tst_QVariant::constructFromQtLT65MetaType()
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+{
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+ auto qsizeIface = QtPrivate::qMetaTypeInterfaceForType<QSize>();
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+
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+ QtPrivate::QMetaTypeInterface qsize64Iface = {
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+ /*revision*/0,
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+ 8,
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+ 8,
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+ QMetaType::NeedsConstruction | QMetaType::NeedsDestruction,
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+ 0,
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+ qsizeIface->metaObjectFn,
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+ "FakeQSize",
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+ qsizeIface->defaultCtr,
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+ qsizeIface->copyCtr,
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+ qsizeIface->moveCtr,
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+ /*dtor =*/ nullptr,
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+ qsizeIface->equals,
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+ qsizeIface->lessThan,
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+ qsizeIface->debugStream,
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+ qsizeIface->dataStreamOut,
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+ qsizeIface->dataStreamIn,
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+ /*legacyregop =*/ nullptr
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+ };
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+ QVariant var{ QMetaType(&qsize64Iface) };
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+ QVERIFY(var.isValid());
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+}
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+
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void tst_QVariant::copyNonDefaultConstructible()
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{
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NonDefaultConstructible ndc(42);
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--
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2.40.0
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@ -1,3 +1,9 @@
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-------------------------------------------------------------------
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Fri Apr 28 13:56:55 UTC 2023 - Christophe Marin <christophe@krop.fr>
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- Add upstream change to fix boo#1210849:
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* 0001-QVariant-Fix-support-for-metatypes-created-by-Qt-6.5.patch
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-------------------------------------------------------------------
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Sat Apr 8 10:42:33 UTC 2023 - Christophe Marin <christophe@krop.fr>
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@ -40,6 +40,7 @@ Source: https://download.qt.io/official_releases/qt/%{short_version}/%{r
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Source99: qt6-base-rpmlintrc
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# Patches 0-100 are upstream patches #
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Patch0: 0001-QApplication-Fix-DEPRECATED_VERSION-for-setActiveWin.patch
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Patch1: 0001-QVariant-Fix-support-for-metatypes-created-by-Qt-6.5.patch
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# Patches 100-200 are openSUSE and/or non-upstream(able) patches #
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Patch100: 0001-Tell-the-truth-about-private-API.patch
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%if 0%{?suse_version} == 1500
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