File 0003-CVE-2023-32763-Fix-specific-overflow-in-qtextlayout.patch of Package qt6-base.29654

From 7cc6296600ef436afaa9ed86d2f8a85869abf62a Mon Sep 17 00:00:00 2001
From: Allan Sandfeld Jensen <allan.jensen@qt.io>
Date: Fri, 5 May 2023 09:51:32 +0200
Subject: [PATCH] Fix specific overflow in qtextlayout

Adds qAddOverflow and qMulOverflow definitions to QFixed

Fixes: QTBUG-113337
Change-Id: I13579306defceaccdc0fbb1ec0e9b77c6f8d1af9
Reviewed-by: Eirik Aavitsland <eirik.aavitsland@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
(cherry picked from commit 7b7a01c266b507636eab51a36328c7c72d82d93c)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
---
 src/gui/painting/qfixed_p.h  | 17 +++++++++++++++++
 src/gui/text/qtextlayout.cpp |  9 ++++++---
 2 files changed, 23 insertions(+), 3 deletions(-)

diff --git a/src/gui/painting/qfixed_p.h b/src/gui/painting/qfixed_p.h
index f3718a097e5f..c0a13d057f54 100644
--- a/src/gui/painting/qfixed_p.h
+++ b/src/gui/painting/qfixed_p.h
@@ -18,6 +18,7 @@
 #include <QtGui/private/qtguiglobal_p.h>
 #include "QtCore/qdebug.h"
 #include "QtCore/qpoint.h"
+#include "QtCore/qnumeric.h"
 #include "QtCore/qsize.h"
 
 QT_BEGIN_NAMESPACE
@@ -136,6 +137,22 @@ constexpr inline QFixed operator+(uint i, QFixed d) { return d+i; }
 constexpr inline QFixed operator-(uint i, QFixed d) { return -(d-i); }
 // constexpr inline QFixed operator*(qreal d, QFixed d2) { return d2*d; }
 
+inline bool qAddOverflow(QFixed v1, QFixed v2, QFixed *r)
+{
+    int val;
+    bool result = qAddOverflow(v1.value(), v2.value(), &val);
+    r->setValue(val);
+    return result;
+}
+
+inline bool qMulOverflow(QFixed v1, QFixed v2, QFixed *r)
+{
+    int val;
+    bool result = qMulOverflow(v1.value(), v2.value(), &val);
+    r->setValue(val);
+    return result;
+}
+
 #ifndef QT_NO_DEBUG_STREAM
 inline QDebug &operator<<(QDebug &dbg, QFixed f)
 { return dbg << f.toReal(); }
diff --git a/src/gui/text/qtextlayout.cpp b/src/gui/text/qtextlayout.cpp
index b8edea11d5f5..611369951c77 100644
--- a/src/gui/text/qtextlayout.cpp
+++ b/src/gui/text/qtextlayout.cpp
@@ -2164,9 +2164,12 @@ found:
         eng->maxWidth = qMax(eng->maxWidth, line.textWidth);
     } else {
         eng->minWidth = qMax(eng->minWidth, lbh.minw);
-        eng->layoutData->currentMaxWidth += line.textWidth;
-        if (!manuallyWrapped)
-            eng->layoutData->currentMaxWidth += lbh.spaceData.textWidth;
+        if (qAddOverflow(eng->layoutData->currentMaxWidth, line.textWidth, &eng->layoutData->currentMaxWidth))
+            eng->layoutData->currentMaxWidth = QFIXED_MAX;
+        if (!manuallyWrapped) {
+            if (qAddOverflow(eng->layoutData->currentMaxWidth, lbh.spaceData.textWidth, &eng->layoutData->currentMaxWidth))
+                eng->layoutData->currentMaxWidth = QFIXED_MAX;
+        }
         eng->maxWidth = qMax(eng->maxWidth, eng->layoutData->currentMaxWidth);
         if (manuallyWrapped)
             eng->layoutData->currentMaxWidth = 0;
-- 
2.16.3