From c5f1dd14098d1cc2cb52448fb44f53966d331443 Mon Sep 17 00:00:00 2001
From: Eirik Aavitsland <eirik.aavitsland@qt.io>
Date: Mon, 9 Jul 2018 10:45:22 +0200
Subject: Fix crash when parsing malformed url reference

The parsing did not check for end of input.

Change-Id: I56a478877d242146395977b767511425d2b8ced1
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
(cherry picked from commit 8c199714e9bc638fb3f6ec747fb7a23373e49335)
(cherry picked from commit 97eebc52a8362f8b841e24ad0e4d54315d1948e3)
---
 src/svg/qsvghandler.cpp                      | 11 ++++++-----
 tests/auto/qsvgrenderer/tst_qsvgrenderer.cpp | 26 ++++++++++++++++++++++++++
 2 files changed, 32 insertions(+), 5 deletions(-)

diff --git a/src/svg/qsvghandler.cpp b/src/svg/qsvghandler.cpp
index 036b870..0cbf139 100644
--- a/src/svg/qsvghandler.cpp
+++ b/src/svg/qsvghandler.cpp
@@ -733,16 +733,17 @@ static QVector<qreal> parsePercentageList(const QChar *&str)
 static QString idFromUrl(const QString &url)
 {
     QString::const_iterator itr = url.constBegin();
-    while ((*itr).isSpace())
+    QString::const_iterator end = url.constEnd();
+    while (itr != end && (*itr).isSpace())
         ++itr;
-    if ((*itr) == QLatin1Char('('))
+    if (itr != end && (*itr) == QLatin1Char('('))
         ++itr;
-    while ((*itr).isSpace())
+    while (itr != end && (*itr).isSpace())
         ++itr;
-    if ((*itr) == QLatin1Char('#'))
+    if (itr != end && (*itr) == QLatin1Char('#'))
         ++itr;
     QString id;
-    while ((*itr) != QLatin1Char(')')) {
+    while (itr != end && (*itr) != QLatin1Char(')')) {
         id += *itr;
         ++itr;
     }
diff --git a/tests/auto/qsvgrenderer/tst_qsvgrenderer.cpp b/tests/auto/qsvgrenderer/tst_qsvgrenderer.cpp
index c272ef7..e974900 100644
--- a/tests/auto/qsvgrenderer/tst_qsvgrenderer.cpp
+++ b/tests/auto/qsvgrenderer/tst_qsvgrenderer.cpp
@@ -59,6 +59,8 @@ private slots:
     void getSetCheck();
     void inexistentUrl();
     void emptyUrl();
+    void invalidUrl_data();
+    void invalidUrl();
     void testStrokeWidth();
     void testMapViewBoxToTarget();
     void testRenderElement();
@@ -137,6 +139,30 @@ void tst_QSvgRenderer::emptyUrl()
     QVERIFY(renderer.isValid());
 }
 
+void tst_QSvgRenderer::invalidUrl_data()
+{
+    QTest::addColumn<QByteArray>("svg");
+
+    QTest::newRow("00") << QByteArray("<svg><circle fill=\"url\" /></svg>");
+    QTest::newRow("01") << QByteArray("<svg><circle fill=\"url0\" /></svg>");
+    QTest::newRow("02") << QByteArray("<svg><circle fill=\"url(0\" /></svg>");
+    QTest::newRow("03") << QByteArray("<svg><circle fill=\"url (0\" /></svg>");
+    QTest::newRow("04") << QByteArray("<svg><circle fill=\"url ( 0\" /></svg>");
+    QTest::newRow("05") << QByteArray("<svg><circle fill=\"url#\" /></svg>");
+    QTest::newRow("06") << QByteArray("<svg><circle fill=\"url#(\" /></svg>");
+    QTest::newRow("07") << QByteArray("<svg><circle fill=\"url(#\" /></svg>");
+    QTest::newRow("08") << QByteArray("<svg><circle fill=\"url(# \" /></svg>");
+    QTest::newRow("09") << QByteArray("<svg><circle fill=\"url(# 0\" /></svg>");
+}
+
+void tst_QSvgRenderer::invalidUrl()
+{
+    QFETCH(QByteArray, svg);
+
+    QSvgRenderer renderer(svg);
+    QVERIFY(renderer.isValid());
+}
+
 void tst_QSvgRenderer::testStrokeWidth()
 {
     qreal squareSize = 30.0;
-- 
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