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7357da |
diff --git a/src/svg/qsvghandler.cpp b/src/svg/qsvghandler.cpp
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index b3d9aaf..402a71f 100644
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--- a/src/svg/qsvghandler.cpp
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+++ b/src/svg/qsvghandler.cpp
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@@ -1614,6 +1614,7 @@ static void pathArc(QPainterPath &path,
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static bool parsePathDataFast(const QStringRef &dataStr, QPainterPath &path)
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{
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+ const int maxElementCount = 0x7fff; // Assume file corruption if more path elements than this
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qreal x0 = 0, y0 = 0; // starting point
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qreal x = 0, y = 0; // current point
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char lastMode = 0;
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@@ -1621,7 +1622,8 @@ static bool parsePathDataFast(const QStringRef &dataStr, QPainterPath &path)
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const QChar *str = dataStr.constData();
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const QChar *end = str + dataStr.size();
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- while (str != end) {
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+ bool ok = true;
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+ while (ok && str != end) {
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while (str->isSpace() && (str + 1) != end)
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++str;
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QChar pathElem = *str;
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@@ -1635,14 +1637,13 @@ static bool parsePathDataFast(const QStringRef &dataStr, QPainterPath &path)
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arg.append(0);//dummy
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const qreal *num = arg.constData();
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int count = arg.count();
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- while (count > 0) {
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+ while (ok && count > 0) {
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qreal offsetX = x; // correction offsets
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qreal offsetY = y; // for relative commands
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switch (pathElem.unicode()) {
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case 'm': {
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if (count < 2) {
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- num++;
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- count--;
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+ ok = false;
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break;
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}
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x = x0 = num[0] + offsetX;
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@@ -1659,8 +1660,7 @@ static bool parsePathDataFast(const QStringRef &dataStr, QPainterPath &path)
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break;
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case 'M': {
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if (count < 2) {
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- num++;
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- count--;
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+ ok = false;
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break;
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}
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x = x0 = num[0];
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@@ -1686,8 +1686,7 @@ static bool parsePathDataFast(const QStringRef &dataStr, QPainterPath &path)
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break;
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case 'l': {
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if (count < 2) {
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- num++;
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- count--;
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+ ok = false;
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break;
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}
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x = num[0] + offsetX;
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@@ -1700,8 +1699,7 @@ static bool parsePathDataFast(const QStringRef &dataStr, QPainterPath &path)
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break;
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case 'L': {
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if (count < 2) {
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- num++;
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- count--;
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+ ok = false;
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break;
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}
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x = num[0];
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@@ -1741,8 +1739,7 @@ static bool parsePathDataFast(const QStringRef &dataStr, QPainterPath &path)
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break;
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case 'c': {
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if (count < 6) {
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- num += count;
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- count = 0;
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+ ok = false;
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break;
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}
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QPointF c1(num[0] + offsetX, num[1] + offsetY);
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@@ -1758,8 +1755,7 @@ static bool parsePathDataFast(const QStringRef &dataStr, QPainterPath &path)
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}
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case 'C': {
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if (count < 6) {
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- num += count;
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- count = 0;
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+ ok = false;
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break;
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}
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QPointF c1(num[0], num[1]);
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@@ -1775,8 +1771,7 @@ static bool parsePathDataFast(const QStringRef &dataStr, QPainterPath &path)
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}
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case 's': {
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if (count < 4) {
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- num += count;
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- count = 0;
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+ ok = false;
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break;
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}
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QPointF c1;
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@@ -1797,8 +1792,7 @@ static bool parsePathDataFast(const QStringRef &dataStr, QPainterPath &path)
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}
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case 'S': {
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if (count < 4) {
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- num += count;
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- count = 0;
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+ ok = false;
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break;
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}
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QPointF c1;
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@@ -1819,8 +1813,7 @@ static bool parsePathDataFast(const QStringRef &dataStr, QPainterPath &path)
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}
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case 'q': {
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if (count < 4) {
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- num += count;
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- count = 0;
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+ ok = false;
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break;
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}
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QPointF c(num[0] + offsetX, num[1] + offsetY);
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@@ -1835,8 +1828,7 @@ static bool parsePathDataFast(const QStringRef &dataStr, QPainterPath &path)
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}
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case 'Q': {
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if (count < 4) {
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- num += count;
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- count = 0;
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+ ok = false;
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break;
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}
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QPointF c(num[0], num[1]);
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@@ -1851,8 +1843,7 @@ static bool parsePathDataFast(const QStringRef &dataStr, QPainterPath &path)
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}
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case 't': {
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if (count < 2) {
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- num += count;
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- count = 0;
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+ ok = false;
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break;
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}
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QPointF e(num[0] + offsetX, num[1] + offsetY);
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@@ -1872,8 +1863,7 @@ static bool parsePathDataFast(const QStringRef &dataStr, QPainterPath &path)
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}
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case 'T': {
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if (count < 2) {
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- num += count;
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- count = 0;
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+ ok = false;
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break;
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}
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QPointF e(num[0], num[1]);
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@@ -1893,8 +1883,7 @@ static bool parsePathDataFast(const QStringRef &dataStr, QPainterPath &path)
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}
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case 'a': {
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if (count < 7) {
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- num += count;
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- count = 0;
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+ ok = false;
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break;
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}
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qreal rx = (*num++);
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@@ -1916,8 +1905,7 @@ static bool parsePathDataFast(const QStringRef &dataStr, QPainterPath &path)
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break;
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case 'A': {
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if (count < 7) {
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- num += count;
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- count = 0;
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+ ok = false;
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break;
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}
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qreal rx = (*num++);
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@@ -1938,12 +1926,15 @@ static bool parsePathDataFast(const QStringRef &dataStr, QPainterPath &path)
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}
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break;
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default:
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- return false;
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+ ok = false;
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+ break;
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}
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lastMode = pathElem.toLatin1();
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+ if (path.elementCount() > maxElementCount)
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+ ok = false;
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}
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}
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- return true;
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+ return ok;
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}
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static bool parseStyle(QSvgNode *node,
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@@ -2979,8 +2970,8 @@ static QSvgNode *createPathNode(QSvgNode *parent,
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QPainterPath qpath;
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qpath.setFillRule(Qt::WindingFill);
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- //XXX do error handling
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- parsePathDataFast(data, qpath);
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+ if (!parsePathDataFast(data, qpath))
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+ qCWarning(lcSvgHandler, "Invalid path data; path truncated.");
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QSvgNode *path = new QSvgPath(parent, qpath);
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return path;
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