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Resolves bz#2037341, CVE-2021-45930

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Than Ngo 2022-01-18 17:36:47 +01:00
parent 9d8864c911
commit e74b5faafc
2 changed files with 227 additions and 1 deletions
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6
qt5-qtsvg.spec
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@ -3,7 +3,7 @@
Summary: Qt5 - Support for rendering and displaying SVG
Name: qt5-%{qt_module}
Version: 5.15.2
Release: 5%{?dist}
Release: 6%{?dist}
# See LGPL_EXCEPTIONS.txt, LICENSE.GPL3, respectively, for exception details
License: LGPLv2 with exceptions or GPLv3 with exceptions
@ -13,6 +13,7 @@ Source0: https://download.qt.io/official_releases/qt/%{majmin}/%{version}/submod
# upstream fix
Patch0: qtsvg-5.15.2-clamp-parsed-doubles-to-float-representtable-values.patch
Patch1: qtsvg-5.15.2-do-strict-error-checking-when-parsing-path-nodes.patch
BuildRequires: make
BuildRequires: qt5-qtbase-devel >= %{version}
@ -89,6 +90,9 @@ popd
%changelog
* Tue Jan 18 2022 Than Ngo <than@redhat.com> - 5.15.2-6
- Resolves bz#2037341, CVE-2021-45930
* Fri Jul 23 2021 Fedora Release Engineering <releng@fedoraproject.org> - 5.15.2-5
- Rebuilt for https://fedoraproject.org/wiki/Fedora_35_Mass_Rebuild

222
qtsvg-5.15.2-do-strict-error-checking-when-parsing-path-nodes.patch Normal file
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@ -0,0 +1,222 @@
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=utf8
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 db29211e..dd869ff7 100644
--- a/src/svg/qsvghandler.cpp
+++ b/src/svg/qsvghandler.cpp
@@ -1595,6 +1595,7 @@ static void pathArc(QPainterPath &path,
static bool parsePathDataFast(QStringView 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;
@@ -1602,7 +1603,8 @@ static bool parsePathDataFast(QStringView dataStr, QPainterPath &path)
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;
@@ -1619,14 +1621,13 @@ static bool parsePathDataFast(QStringView dataStr, QPainterPath &path)
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;
@@ -1643,8 +1644,7 @@ static bool parsePathDataFast(QStringView dataStr, QPainterPath &path)
break;
case 'M': {
if (count < 2) {
- num++;
- count--;
+ ok = false;
break;
}
x = x0 = num[0];
@@ -1670,8 +1670,7 @@ static bool parsePathDataFast(QStringView dataStr, QPainterPath &path)
break;
case 'l': {
if (count < 2) {
- num++;
- count--;
+ ok = false;
break;
}
x = num[0] + offsetX;
@@ -1684,8 +1683,7 @@ static bool parsePathDataFast(QStringView dataStr, QPainterPath &path)
break;
case 'L': {
if (count < 2) {
- num++;
- count--;
+ ok = false;
break;
}
x = num[0];
@@ -1725,8 +1723,7 @@ static bool parsePathDataFast(QStringView dataStr, QPainterPath &path)
break;
case 'c': {
if (count < 6) {
- num += count;
- count = 0;
+ ok = false;
break;
}
QPointF c1(num[0] + offsetX, num[1] + offsetY);
@@ -1742,8 +1739,7 @@ static bool parsePathDataFast(QStringView dataStr, QPainterPath &path)
}
case 'C': {
if (count < 6) {
- num += count;
- count = 0;
+ ok = false;
break;
}
QPointF c1(num[0], num[1]);
@@ -1759,8 +1755,7 @@ static bool parsePathDataFast(QStringView dataStr, QPainterPath &path)
}
case 's': {
if (count < 4) {
- num += count;
- count = 0;
+ ok = false;
break;
}
QPointF c1;
@@ -1781,8 +1776,7 @@ static bool parsePathDataFast(QStringView dataStr, QPainterPath &path)
}
case 'S': {
if (count < 4) {
- num += count;
- count = 0;
+ ok = false;
break;
}
QPointF c1;
@@ -1803,8 +1797,7 @@ static bool parsePathDataFast(QStringView dataStr, QPainterPath &path)
}
case 'q': {
if (count < 4) {
- num += count;
- count = 0;
+ ok = false;
break;
}
QPointF c(num[0] + offsetX, num[1] + offsetY);
@@ -1819,8 +1812,7 @@ static bool parsePathDataFast(QStringView dataStr, QPainterPath &path)
}
case 'Q': {
if (count < 4) {
- num += count;
- count = 0;
+ ok = false;
break;
}
QPointF c(num[0], num[1]);
@@ -1835,8 +1827,7 @@ static bool parsePathDataFast(QStringView dataStr, QPainterPath &path)
}
case 't': {
if (count < 2) {
- num += count;
- count = 0;
+ ok = false;
break;
}
QPointF e(num[0] + offsetX, num[1] + offsetY);
@@ -1856,8 +1847,7 @@ static bool parsePathDataFast(QStringView dataStr, QPainterPath &path)
}
case 'T': {
if (count < 2) {
- num += count;
- count = 0;
+ ok = false;
break;
}
QPointF e(num[0], num[1]);
@@ -1877,8 +1867,7 @@ static bool parsePathDataFast(QStringView dataStr, QPainterPath &path)
}
case 'a': {
if (count < 7) {
- num += count;
- count = 0;
+ ok = false;
break;
}
qreal rx = (*num++);
@@ -1900,8 +1889,7 @@ static bool parsePathDataFast(QStringView dataStr, QPainterPath &path)
break;
case 'A': {
if (count < 7) {
- num += count;
- count = 0;
+ ok = false;
break;
}
qreal rx = (*num++);
@@ -1922,12 +1910,15 @@ static bool parsePathDataFast(QStringView dataStr, QPainterPath &path)
}
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,
@@ -2985,8 +2976,8 @@ static QSvgNode *createPathNode(QSvgNode *parent,
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;
--
2.16.3