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!14 Fix CVE-2021-45930

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Merge pull request !14 from wk333/master
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openeuler-ci-bot 2022-01-14 01:44:56 +00:00 committed by Gitee
commit 2de3bda776
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2 changed files with 226 additions and 1 deletions
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CVE-2021-45930.patch Normal file
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@ -0,0 +1,221 @@
From 36cfd9efb9b22b891adee9c48d30202289cfa620 Mon Sep 17 00:00:00 2001
From: Eirik Aavitsland <eirik.aavitsland@qt.io>
Date: Mon, 25 Oct 2021 14:17:55 +0200
Subject: [PATCH] Do stricter error checking when parsing path nodes
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
The SVG spec mandates that path parsing should terminate on the first
error encountered, and an error be reported. To improve the handling
of corrupt files, implement such error handling, and also limit the
number of QPainterPath elements to a reasonable range.
Fixes: QTBUG-96044
Pick-to: 6.2 5.15 5.12
Change-Id: Ic5e65d6b658516d6f1317c72de365c8c7ad81891
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>
Reviewed-by: Robert Löhning <robert.loehning@qt.io>
---
src/svg/qsvghandler.cpp | 59 +++++++++++++++++------------------------
1 file changed, 25 insertions(+), 34 deletions(-)
diff --git a/src/svg/qsvghandler.cpp b/src/svg/qsvghandler.cpp
index db29211..dd869ff 100644
--- a/src/svg/qsvghandler.cpp
+++ b/src/svg/qsvghandler.cpp
@@ -1615,6 +1615,7 @@ static void pathArc(QPainterPath &path,
static bool parsePathDataFast(const QStringRef &dataStr, QPainterPath &path)
{
+ const int maxElementCount = 0x7fff; // Assume file corruption if more path elements than this
qreal x0 = 0, y0 = 0; // starting point
qreal x = 0, y = 0; // current point
char lastMode = 0;
@@ -1622,7 +1623,8 @@ static bool parsePathDataFast(const QStr
const QChar *str = dataStr.constData();
const QChar *end = str + dataStr.size();
- while (str != end) {
+ bool ok = true;
+ while (ok && str != end) {
while (str->isSpace() && (str + 1) != end)
++str;
QChar pathElem = *str;
@@ -1636,14 +1638,13 @@ static bool parsePathDataFast(const QStr
arg.append(0);//dummy
const qreal *num = arg.constData();
int count = arg.count();
- while (count > 0) {
+ while (ok && count > 0) {
qreal offsetX = x; // correction offsets
qreal offsetY = y; // for relative commands
switch (pathElem.unicode()) {
case 'm': {
if (count < 2) {
- num++;
- count--;
+ ok = false;
break;
}
x = x0 = num[0] + offsetX;
@@ -1660,8 +1661,7 @@ static bool parsePathDataFast(const QStr
break;
case 'M': {
if (count < 2) {
- num++;
- count--;
+ ok = false;
break;
}
x = x0 = num[0];
@@ -1687,8 +1687,7 @@ static bool parsePathDataFast(const QStr
break;
case 'l': {
if (count < 2) {
- num++;
- count--;
+ ok = false;
break;
}
x = num[0] + offsetX;
@@ -1701,8 +1700,7 @@ static bool parsePathDataFast(const QStr
break;
case 'L': {
if (count < 2) {
- num++;
- count--;
+ ok = false;
break;
}
x = num[0];
@@ -1742,8 +1740,7 @@ static bool parsePathDataFast(const QStr
break;
case 'c': {
if (count < 6) {
- num += count;
- count = 0;
+ ok = false;
break;
}
QPointF c1(num[0] + offsetX, num[1] + offsetY);
@@ -1759,8 +1756,7 @@ static bool parsePathDataFast(const QStr
}
case 'C': {
if (count < 6) {
- num += count;
- count = 0;
+ ok = false;
break;
}
QPointF c1(num[0], num[1]);
@@ -1776,8 +1772,7 @@ static bool parsePathDataFast(const QStr
}
case 's': {
if (count < 4) {
- num += count;
- count = 0;
+ ok = false;
break;
}
QPointF c1;
@@ -1798,8 +1793,7 @@ static bool parsePathDataFast(const QStr
}
case 'S': {
if (count < 4) {
- num += count;
- count = 0;
+ ok = false;
break;
}
QPointF c1;
@@ -1820,8 +1814,7 @@ static bool parsePathDataFast(const QStr
}
case 'q': {
if (count < 4) {
- num += count;
- count = 0;
+ ok = false;
break;
}
QPointF c(num[0] + offsetX, num[1] + offsetY);
@@ -1836,8 +1829,7 @@ static bool parsePathDataFast(const QStr
}
case 'Q': {
if (count < 4) {
- num += count;
- count = 0;
+ ok = false;
break;
}
QPointF c(num[0], num[1]);
@@ -1852,8 +1844,7 @@ static bool parsePathDataFast(const QStr
}
case 't': {
if (count < 2) {
- num += count;
- count = 0;
+ ok = false;
break;
}
QPointF e(num[0] + offsetX, num[1] + offsetY);
@@ -1873,8 +1864,7 @@ static bool parsePathDataFast(const QStr
}
case 'T': {
if (count < 2) {
- num += count;
- count = 0;
+ ok = false;
break;
}
QPointF e(num[0], num[1]);
@@ -1894,8 +1884,7 @@ static bool parsePathDataFast(const QStr
}
case 'a': {
if (count < 7) {
- num += count;
- count = 0;
+ ok = false;
break;
}
qreal rx = (*num++);
@@ -1917,8 +1906,7 @@ static bool parsePathDataFast(const QStr
break;
case 'A': {
if (count < 7) {
- num += count;
- count = 0;
+ ok = false;
break;
}
qreal rx = (*num++);
@@ -1939,12 +1927,15 @@ static bool parsePathDataFast(const QStr
}
break;
default:
- return false;
+ ok = false;
+ break;
}
lastMode = pathElem.toLatin1();
+ if (path.elementCount() > maxElementCount)
+ ok = false;
}
}
- return true;
+ return ok;
}
static bool parseStyle(QSvgNode *node,
@@ -2980,8 +2971,8 @@ static QSvgNode *createPathNode(QSvgNode
QPainterPath qpath;
qpath.setFillRule(Qt::WindingFill);
- //XXX do error handling
- parsePathDataFast(data, qpath);
+ if (!parsePathDataFast(data, qpath))
+ qCWarning(lcSvgHandler, "Invalid path data; path truncated.");
QSvgNode *path = new QSvgPath(parent, qpath);
return path;

6
qt5-qtsvg.spec
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@ -1,12 +1,13 @@
Name: qt5-qtsvg
Version: 5.15.2
Release: 1
Release: 2
Summary: Qt GUI toolkit for rendering and displaying SVG
License: LGPLv2 with exceptions or GPLv3 with exceptions
Url: http://www.qt.io
%global majmin %(echo %{version} | cut -d. -f1-2)
Source0: https://download.qt.io/official_releases/qt/%{majmin}/%{version}/submodules/qtsvg-everywhere-src-%{version}.tar.xz
Patch0: qtsvg-5.15.2-clamp-parsed-doubles-to-float-representtable-values.patch
Patch1: CVE-2021-45930.patch
BuildRequires: make
BuildRequires: qt5-qtbase-devel >= %{version} pkgconfig(zlib) qt5-qtbase-private-devel
@ -64,6 +65,9 @@ popd
%{_qt5_archdatadir}/mkspecs/modules/qt_lib_svg*.pri
%changelog
* Thu Jan 13 2022 wangkai <wangkai385@huawei.com> - 5.15.2-2
- Fix CVE-2021-45930
* Wed Dec 29 2021 peijiankang <peijiankang@kylinos.cn> - 5.15.2-1
- update to upstream version 5.15.2