QDomDocument::toByteArray() crashed in case of high XML nesting level
The issue the combination of: - 300+ XML nesting level - Small stack size, by default on Windows (1 MB) - Unexpected and unexplained large stack frames with MSVC (3.5 kB) The described factors combination leads to the stack overflow on Windows + MSVC. To fix the problem, I got rid of the recursive call from QDomElementPrivate::save() and removed QDomNodePrivate::save() implementation. Instead of those I added the method that iterates through the tree not using recursion. [ChangeLog][QtXml] QDomDocument::toByteArray() now iterates the nodes of the document instead of recursing into subnodes. This avoids a stack-overflow crash that used to arise with deeply-nested document structures. Fixes: QTBUG-131151 Change-Id: Ib74aaef1422716f2aafcb89dfc8c05ef334e2a54 Reviewed-by: Thiago Macieira <thiago.macieira@intel.com> (cherry picked from commit 387633a6069a5e0e9b976971691b1b82725b6132)
This commit is contained in:
Tatiana Borisova
parent
03565b3956
commit
948599e7b7
@ -1349,16 +1349,40 @@ void QDomNodePrivate::normalize()
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qNormalizeNode(this);
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}
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/*! \internal
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\a depth is used for indentation, it seems.
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*/
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void QDomNodePrivate::save(QTextStream& s, int depth, int indent) const
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void QDomNodePrivate::saveSubTree(const QDomNodePrivate *n, QTextStream &s,
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int depth, int indent) const
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{
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const QDomNodePrivate* n = first;
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while (n) {
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n->save(s, depth, indent);
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n = n->next;
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if (!n)
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return;
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const QDomNodePrivate *root = n->first;
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n->save(s, depth, indent);
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if (root) {
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const int branchDepth = depth + 1;
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int layerDepth = 0;
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while (root) {
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root->save(s, layerDepth + branchDepth, indent);
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// A flattened (non-recursive) depth-first walk through the node tree.
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if (root->first) {
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layerDepth ++;
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root = root->first;
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continue;
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}
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root->afterSave(s, layerDepth + branchDepth, indent);
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const QDomNodePrivate *prev = root;
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root = root->next;
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// Close QDomElementPrivate groups
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while (!root && prev && (layerDepth > 0)) {
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root = prev->parent();
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layerDepth --;
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root->afterSave(s, layerDepth + branchDepth, indent);
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prev = root;
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root = root->next;
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}
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}
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Q_ASSERT(layerDepth == 0);
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}
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n->afterSave(s, depth, indent);
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}
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void QDomNodePrivate::setLocation(int lineNumber, int columnNumber)
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@ -2146,7 +2170,7 @@ void QDomNode::save(QTextStream& stream, int indent, EncodingPolicy encodingPoli
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if (isDocument())
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static_cast<const QDomDocumentPrivate *>(impl)->saveDocument(stream, indent, encodingPolicy);
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else
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IMPL->save(stream, 1, indent);
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IMPL->saveSubTree(IMPL, stream, 1, indent);
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}
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/*!
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@ -3064,11 +3088,11 @@ void QDomDocumentTypePrivate::save(QTextStream& s, int, int indent) const
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auto it2 = notations->map.constBegin();
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for (; it2 != notations->map.constEnd(); ++it2)
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it2.value()->save(s, 0, indent);
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it2.value()->saveSubTree(it2.value(), s, 0, indent);
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auto it = entities->map.constBegin();
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for (; it != entities->map.constEnd(); ++it)
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it.value()->save(s, 0, indent);
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it.value()->saveSubTree(it.value(), s, 0, indent);
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s << ']';
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}
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@ -4121,13 +4145,25 @@ void QDomElementPrivate::save(QTextStream& s, int depth, int indent) const
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if (indent != -1)
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s << Qt::endl;
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}
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QDomNodePrivate::save(s, depth + 1, indent); if (!last->isText())
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s << QString(indent < 1 ? 0 : depth * indent, u' ');
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s << "</" << qName << '>';
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} else {
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s << "/>";
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}
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}
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void QDomElementPrivate::afterSave(QTextStream &s, int depth, int indent) const
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{
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if (last) {
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QString qName(name);
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if (!prefix.isEmpty())
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qName = prefix + u':' + name;
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if (!last->isText())
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s << QString(indent < 1 ? 0 : depth * indent, u' ');
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s << "</" << qName << '>';
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}
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if (!(next && next->isText())) {
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/* -1 disables new lines. */
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if (indent != -1)
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@ -5908,7 +5944,7 @@ void QDomDocumentPrivate::saveDocument(QTextStream& s, const int indent, QDomNod
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type->save(s, 0, indent);
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doc = true;
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}
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n->save(s, 0, indent);
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n->saveSubTree(n, s, 0, indent);
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n = n->next;
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}
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}
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@ -5935,8 +5971,8 @@ void QDomDocumentPrivate::saveDocument(QTextStream& s, const int indent, QDomNod
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}
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// Now we serialize all the nodes after the faked XML declaration(the PI).
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while(startNode) {
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startNode->save(s, 0, indent);
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while (startNode) {
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startNode->saveSubTree(startNode, s, 0, indent);
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startNode = startNode->next;
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}
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}
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@ -109,7 +109,9 @@ public:
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virtual QDomNode::NodeType nodeType() const { return QDomNode::BaseNode; }
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virtual void save(QTextStream &, int, int) const;
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void saveSubTree(const QDomNodePrivate *n, QTextStream &s, int depth, int indent) const;
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virtual void save(QTextStream &, int, int) const {}
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virtual void afterSave(QTextStream &, int, int) const {}
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void setLocation(int lineNumber, int columnNumber);
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@ -328,6 +330,7 @@ public:
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QDomNode::NodeType nodeType() const override { return QDomNode::ElementNode; }
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QDomNodePrivate *cloneNode(bool deep = true) override;
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virtual void save(QTextStream &s, int, int) const override;
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virtual void afterSave(QTextStream &s, int, int) const override;
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// Variables
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QDomNamedNodeMapPrivate *m_attr;
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396
tests/auto/xml/dom/qdom/testdata/deeply-nested.svg
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396
tests/auto/xml/dom/qdom/testdata/deeply-nested.svg
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@ -0,0 +1,396 @@
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<?xml version="1.0" encoding="iso-8859-1"?>
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<svg version="1.1" xmlns="http://www.w3.org/2000/svg"
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xmlns:xlink="http://www.w3.org/1999/xlink"
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xml:space="preserve" viewBox="0 0 300 300">
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<g fill="#CB8252">
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<g><rect x="25" y="220" width="50" height="50" />
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<g><rect x="25" y="220" width="50" height="50" />
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||||
<g><rect x="25" y="220" width="50" height="50" />
|
||||
<!-- 376 -->
|
||||
</g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g>
|
||||
</g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g>
|
||||
</g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g>
|
||||
</g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g>
|
||||
</g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g>
|
||||
</g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g>
|
||||
</g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g>
|
||||
</g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g>
|
||||
</g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g>
|
||||
</g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g></g>
|
||||
</svg>
|
||||
|
After Width: | Height: | Size: 22 KiB |
@ -114,6 +114,7 @@ private slots:
|
||||
void QTBUG49113_dontCrashWithNegativeIndex() const;
|
||||
void standalone();
|
||||
void splitTextLeakMemory() const;
|
||||
void noCrashOnDeepNesting() const;
|
||||
|
||||
void cleanupTestCase() const;
|
||||
|
||||
@ -2337,5 +2338,21 @@ void tst_QDom::splitTextLeakMemory() const
|
||||
QCOMPARE(end.impl->ref.loadRelaxed(), 2);
|
||||
}
|
||||
|
||||
// The fix of QTBUG-131151 crash
|
||||
void tst_QDom::noCrashOnDeepNesting() const
|
||||
{
|
||||
const QString prefix = QFINDTESTDATA("testdata/");
|
||||
if (prefix.isEmpty())
|
||||
QFAIL("Cannot find testdata directory!");
|
||||
|
||||
QFile file(prefix + "/deeply-nested.svg");
|
||||
QVERIFY(file.open(QIODevice::ReadOnly));
|
||||
QDomDocument doc;
|
||||
doc.setContent(&file);
|
||||
QByteArray array = doc.toByteArray();
|
||||
QVERIFY(array.size());
|
||||
file.close();
|
||||
}
|
||||
|
||||
QTEST_MAIN(tst_QDom)
|
||||
#include "tst_qdom.moc"
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user