From d0f2635e1000368898832fa19a8d4be1203f6d7d Mon Sep 17 00:00:00 2001
From: Albert Astals Cid <aacid@kde.org>
Date: Mon, 3 Mar 2025 21:51:03 +0100
Subject: [PATCH] sct: qRound with param bigger than max int is undefined

oss-fuzz/399667098
---
 src/imageformats/sct.cpp  | 8 ++++----
 src/imageformats/util_p.h | 9 +++++++++
 2 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/src/imageformats/sct.cpp b/src/imageformats/sct.cpp
index 51b1aab..5b7f923 100644
--- a/src/imageformats/sct.cpp
+++ b/src/imageformats/sct.cpp
@@ -207,10 +207,10 @@ public:
         auto v = QString::fromLatin1(pchar_t(res.data()), res.size()).toDouble(&ok);
         if (ok && v > 0) {
             if (m_pb._unitsOfMeasurement) { // Inches
-                return qRound(width() / v / 25.4 * 1000);
+                return qRoundOrZero(width() / v / 25.4 * 1000);
             }
             // Millimeters
-            return qRound(width() / v * 1000);
+            return qRoundOrZero(width() / v * 1000);
         }
         return 0;
     }
@@ -221,10 +221,10 @@ public:
         auto v = QString::fromLatin1(pchar_t(res.data()), res.size()).toDouble(&ok);
         if (ok && v > 0) {
             if (m_pb._unitsOfMeasurement) { // Inches
-                return qRound(height() / v / 25.4 * 1000);
+                return qRoundOrZero(height() / v / 25.4 * 1000);
             }
             // Millimeters
-            return qRound(height() / v * 1000);
+            return qRoundOrZero(height() / v * 1000);
         }
         return 0;
     }
diff --git a/src/imageformats/util_p.h b/src/imageformats/util_p.h
index 225c0b5..d88dec3 100644
--- a/src/imageformats/util_p.h
+++ b/src/imageformats/util_p.h
@@ -60,4 +60,13 @@ inline QImage imageAlloc(qint32 width, qint32 height, const QImage::Format &form
     return imageAlloc(QSize(width, height), format);
 }
 
+inline double qRoundOrZero(double d)
+{
+    // If the value d is outside the range of int, the behavior is undefined.
+    if (d > std::numeric_limits<int>::max()) {
+        return 0;
+    }
+    return qRound(d);
+}
+
 #endif // UTIL_P_H