From ac5fe9319bf9b688262066aba73094558010350f Mon Sep 17 00:00:00 2001
From: Christian Ehrlicher <ch.ehrlicher@gmx.de>
Date: Sun, 12 Nov 2023 13:49:16 +0100
Subject: [PATCH 138/147] QDial: don't crash when min==max and setting a value
 != min & max

QDial::bound() is crashing when min == max due to a division by zero.
Therefore check for this condition beforehand and return min.

Pick-to: 6.6 6.5 6.2 5.15
Fixes: QTBUG-104641
Change-Id: I612625af1ad18333d59a7771abfdec602301b58e
Reviewed-by: Axel Spoerl <axel.spoerl@qt.io>
(cherry picked from commit e4315204b1412d74842b3167c3eb9a49dc233355)
---
 src/widgets/widgets/qdial.cpp                  |  2 ++
 tests/auto/widgets/widgets/qdial/tst_qdial.cpp | 10 ++++++++++
 2 files changed, 12 insertions(+)

diff --git a/src/widgets/widgets/qdial.cpp b/src/widgets/widgets/qdial.cpp
index 8f774a3cc7..ec5cec0d82 100644
--- a/src/widgets/widgets/qdial.cpp
+++ b/src/widgets/widgets/qdial.cpp
@@ -94,6 +94,8 @@ int QDialPrivate::bound(int val) const
     if (wrapping) {
         if ((val >= minimum) && (val <= maximum))
             return val;
+        if (minimum == maximum)
+            return minimum;
         val = minimum + ((val - minimum) % (maximum - minimum));
         if (val < minimum)
             val += maximum - minimum;
diff --git a/tests/auto/widgets/widgets/qdial/tst_qdial.cpp b/tests/auto/widgets/widgets/qdial/tst_qdial.cpp
index 356f773ae9..a014df3b15 100644
--- a/tests/auto/widgets/widgets/qdial/tst_qdial.cpp
+++ b/tests/auto/widgets/widgets/qdial/tst_qdial.cpp
@@ -42,6 +42,7 @@ private slots:
     void valueChanged();
     void sliderMoved();
     void wrappingCheck();
+    void minEqualMaxValueOutsideRange();
 };
 
 // Testing get/set functions
@@ -194,5 +195,14 @@ void tst_QDial::wrappingCheck()
     }
 }
 
+// QTBUG-104641
+void tst_QDial::minEqualMaxValueOutsideRange()
+{
+    QDial dial;
+    dial.setRange(30, 30);
+    dial.setWrapping(true);
+    dial.setValue(45);
+}
+
 QTEST_MAIN(tst_QDial)
 #include "tst_qdial.moc"
-- 
2.40.1