4 files changed, 32 insertions, 0 deletions
diff --git a/tests/auto/gui/text/qtextmarkdownimporter/data/fuzz20450.md b/tests/auto/gui/text/qtextmarkdownimporter/data/fuzz20450.md
new file mode 100644
index 0000000000..d7005cb01e
--- /dev/null
+++ b/tests/auto/gui/text/qtextmarkdownimporter/data/fuzz20450.md
@@ -0,0 +1,5 @@
+<t>ÿ
+* ÿ
+
+	ÿ
+* ÿ
+\ No newline at end of file
diff --git a/tests/auto/gui/text/qtextmarkdownimporter/data/fuzz20580.md b/tests/auto/gui/text/qtextmarkdownimporter/data/fuzz20580.md
new file mode 100644
index 0000000000..22006f5876
--- /dev/null
+++ b/tests/auto/gui/text/qtextmarkdownimporter/data/fuzz20580.md
@@ -0,0 +1 @@
+|
+--:|
+<?`?><?|`
+\ No newline at end of file
diff --git a/tests/auto/gui/text/qtextmarkdownimporter/qtextmarkdownimporter.pro b/tests/auto/gui/text/qtextmarkdownimporter/qtextmarkdownimporter.pro
index 7b7fb61244..f3818efbf7 100644
--- a/tests/auto/gui/text/qtextmarkdownimporter/qtextmarkdownimporter.pro
+++ b/tests/auto/gui/text/qtextmarkdownimporter/qtextmarkdownimporter.pro
@@ -5,5 +5,7 @@ SOURCES += tst_qtextmarkdownimporter.cpp
 TESTDATA += \
     data/thematicBreaks.md \
     data/headingBulletsContinuations.md \
+    data/fuzz20450.md \
+    data/fuzz20580.md \
 
 DEFINES += SRCDIR=\\\"$$PWD\\\"
diff --git a/tests/auto/gui/text/qtextmarkdownimporter/tst_qtextmarkdownimporter.cpp b/tests/auto/gui/text/qtextmarkdownimporter/tst_qtextmarkdownimporter.cpp
index 39a1370f6f..5eb04af696 100644
--- a/tests/auto/gui/text/qtextmarkdownimporter/tst_qtextmarkdownimporter.cpp
+++ b/tests/auto/gui/text/qtextmarkdownimporter/tst_qtextmarkdownimporter.cpp
@@ -57,6 +57,8 @@ private slots:
     void lists();
     void avoidBlankLineAtBeginning_data();
     void avoidBlankLineAtBeginning();
+    void pathological_data();
+    void pathological();
 };
 
 void tst_QTextMarkdownImporter::headingBulletsContinuations()
@@ -256,5 +258,27 @@ void tst_QTextMarkdownImporter::avoidBlankLineAtBeginning() // QTBUG-81060
     QCOMPARE(i, expectedNumberOfParagraphs);
 }
 
+void tst_QTextMarkdownImporter::pathological_data()
+{
+    QTest::addColumn<QString>("warning");
+    QTest::newRow("fuzz20450") << "attempted to insert into a list that no longer exists";
+    QTest::newRow("fuzz20580") << "";
+}
+
+void tst_QTextMarkdownImporter::pathological() // avoid crashing on crazy input
+{
+    QFETCH(QString, warning);
+    QString filename = QLatin1String("data/") + QTest::currentDataTag() + QLatin1String(".md");
+    QFile f(QFINDTESTDATA(filename));
+    QVERIFY(f.open(QFile::ReadOnly));
+#ifdef QT_NO_DEBUG
+    Q_UNUSED(warning)
+#else
+    if (!warning.isEmpty())
+        QTest::ignoreMessage(QtWarningMsg, warning.toLatin1());
+#endif
+    QTextDocument().setMarkdown(f.readAll());
+}
+
 QTEST_MAIN(tst_QTextMarkdownImporter)
 #include "tst_qtextmarkdownimporter.moc"