1 files changed, 53 insertions, 0 deletions
diff --git a/tests/auto/corelib/tools/qcryptographichash/tst_qcryptographichash.cpp b/tests/auto/corelib/tools/qcryptographichash/tst_qcryptographichash.cpp
index 3eef7631c8..3abd68857f 100644
--- a/tests/auto/corelib/tools/qcryptographichash/tst_qcryptographichash.cpp
+++ b/tests/auto/corelib/tools/qcryptographichash/tst_qcryptographichash.cpp
@@ -47,6 +47,12 @@ private slots:
     void files_data();
     void files();
     void hashLength();
+
+    // keep last
+    void keccakBufferOverflow();
+private:
+    void ensureLargeData();
+    std::vector<char> large;
 };
 
 void tst_QCryptographicHash::repeated_result_data()
@@ -303,5 +309,52 @@ void tst_QCryptographicHash::hashLength()
     }
 }
 
+void tst_QCryptographicHash::ensureLargeData()
+{
+#if QT_POINTER_SIZE > 4
+    QElapsedTimer timer;
+    timer.start();
+    const size_t GiB = 1024 * 1024 * 1024;
+    if (large.size() == 4 * GiB + 1)
+        return;
+    try {
+        large.resize(4 * GiB + 1, '\0');
+    } catch (const std::bad_alloc &) {
+        QSKIP("Could not allocate 4GiB plus one byte of RAM.");
+    }
+    QCOMPARE(large.size(), 4 * GiB + 1);
+    large.back() = '\1';
+    qDebug("created dataset in %lld ms", timer.elapsed());
+#endif
+}
+
+void tst_QCryptographicHash::keccakBufferOverflow()
+{
+#if QT_POINTER_SIZE == 4
+    QSKIP("This is a 64-bit-only test");
+#else
+
+    ensureLargeData();
+    if (large.empty())
+        return;
+
+    QElapsedTimer timer;
+    timer.start();
+    const auto sg = qScopeGuard([&] {
+        qDebug() << "test finished in" << timer.restart() << "ms";
+    });
+
+    constexpr qsizetype magic = INT_MAX/4;
+    QVERIFY(large.size() >= size_t(magic + 1));
+
+    QCryptographicHash hash(QCryptographicHash::Algorithm::Keccak_224);
+
+    hash.addData(large.data(), 1);
+    hash.addData(large.data() + 1, magic);
+    (void)hash.result();
+    QVERIFY(true); // didn't crash
+#endif
+}
+
 QTEST_MAIN(tst_QCryptographicHash)
 #include "tst_qcryptographichash.moc"