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Fix integer overflow in QSpinBox.

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Change-Id: Ic204d42fbdffc44576f7e76132bc53621e836299
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>
This commit is contained in:
Stephen Kelly 2012-10-18 13:36:02 +02:00 committed by The Qt Project
parent d18eb260d7
commit efc475a996
2 changed files with 48 additions and 2 deletions
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19
src/widgets/widgets/qabstractspinbox.cpp
View File

@ -1904,7 +1904,20 @@ QVariant operator+(const QVariant &arg1, const QVariant &arg2)
qWarning("QAbstractSpinBox: Internal error: Different types (%s vs %s) (%s:%d)",
arg1.typeName(), arg2.typeName(), __FILE__, __LINE__);
switch (arg1.type()) {
case QVariant::Int: ret = QVariant(arg1.toInt() + arg2.toInt()); break;
case QVariant::Int: {
const int int1 = arg1.toInt();
const int int2 = arg2.toInt();
if (int1 > 0 && (int2 >= INT_MAX - int1)) {
// The increment overflows
ret = QVariant(INT_MAX);
} else if (int1 < 0 && (int2 <= INT_MIN - int1)) {
// The increment underflows
ret = QVariant(INT_MIN);
} else {
ret = QVariant(int1 + int2);
}
break;
}
case QVariant::Double: ret = QVariant(arg1.toDouble() + arg2.toDouble()); break;
case QVariant::DateTime: {
QDateTime a2 = arg2.toDateTime();
@ -1962,7 +1975,9 @@ QVariant operator*(const QVariant &arg1, double multiplier)
QVariant ret;
switch (arg1.type()) {
case QVariant::Int: ret = QVariant((int)(arg1.toInt() * multiplier)); break;
case QVariant::Int:
ret = static_cast<int>(qBound<double>(INT_MIN, arg1.toInt() * multiplier, INT_MAX));
break;
case QVariant::Double: ret = QVariant(arg1.toDouble() * multiplier); break;
case QVariant::DateTime: {
double days = QDATETIMEEDIT_DATE_MIN.daysTo(arg1.toDateTime().date()) * multiplier;

31
tests/auto/widgets/widgets/qspinbox/tst_qspinbox.cpp
View File

@ -135,6 +135,8 @@ private slots:
void sizeHint();
void integerOverflow();
void taskQTBUG_5008_textFromValueAndValidate();
public slots:
@ -1014,6 +1016,35 @@ void tst_QSpinBox::taskQTBUG_5008_textFromValueAndValidate()
QCOMPARE(spinbox.text(), spinbox.locale().toString(spinbox.value()));
}
void tst_QSpinBox::integerOverflow()
{
QSpinBox sb;
sb.setRange(INT_MIN, INT_MAX);
sb.setValue(INT_MAX - 1);
sb.stepUp();
QCOMPARE(sb.value(), INT_MAX);
sb.stepUp();
QCOMPARE(sb.value(), INT_MAX);
sb.setValue(INT_MIN + 1);
sb.stepDown();
QCOMPARE(sb.value(), INT_MIN);
sb.stepDown();
QCOMPARE(sb.value(), INT_MIN);
sb.setValue(0);
QCOMPARE(sb.value(), 0);
sb.setSingleStep(INT_MAX);
sb.stepUp();
QCOMPARE(sb.value(), INT_MAX);
sb.stepDown();
QCOMPARE(sb.value(), 0);
sb.stepDown();
QCOMPARE(sb.value(), INT_MIN + 1);
sb.stepDown();
QCOMPARE(sb.value(), INT_MIN);
}
QTEST_MAIN(tst_QSpinBox)
#include "tst_qspinbox.moc"