Description: Fix CVE-2023-24607
 CVE-2023-24607 can trigger a DOS with a specifically crafted string,
 see https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1031871.
 This patch https://codereview.qt-project.org/c/qt/qtbase/+/456216,
 https://codereview.qt-project.org/c/qt/qtbase/+/457637 and
 https://codereview.qt-project.org/c/qt/qtbase/+/457937
 See: https://www.qt.io/blog/security-advisory-qt-sql-odbc-driver-plugin
Forwarded: not-needed

--- a/src/plugins/sqldrivers/odbc/qsql_odbc.cpp
+++ b/src/plugins/sqldrivers/odbc/qsql_odbc.cpp
@@ -58,23 +58,39 @@ inline static QString fromSQLTCHAR(const QVarLengthArray<SQLTCHAR>& input, qsize
     return result;
 }

+template <size_t SizeOfChar = sizeof(SQLTCHAR)>
+void toSQLTCHARImpl(QVarLengthArray<SQLTCHAR> &result, const QString &input); // primary template undefined
+
+template <typename Container>
+void do_append(QVarLengthArray<SQLTCHAR> &result, const Container &c)
+{
+    result.append(reinterpret_cast<const SQLTCHAR *>(c.data()), c.size());
+}
+
+template <>
+void toSQLTCHARImpl<1>(QVarLengthArray<SQLTCHAR> &result, const QString &input)
+{
+    const auto u8 = input.toUtf8();
+    do_append(result, u8);
+}
+
+template <>
+void toSQLTCHARImpl<2>(QVarLengthArray<SQLTCHAR> &result, const QString &input)
+{
+    do_append(result, input);
+}
+
+template <>
+void toSQLTCHARImpl<4>(QVarLengthArray<SQLTCHAR> &result, const QString &input)
+{
+    const auto u32 = input.toUcs4();
+    do_append(result, u32);
+}
+
 inline static QVarLengthArray<SQLTCHAR> toSQLTCHAR(const QString &input)
 {
     QVarLengthArray<SQLTCHAR> result;
-    result.resize(input.size());
-    switch(sizeof(SQLTCHAR)) {
-        case 1:
-            memcpy(result.data(), input.toUtf8().data(), input.size());
-            break;
-        case 2:
-            memcpy(result.data(), input.unicode(), input.size() * 2);
-            break;
-        case 4:
-            memcpy(result.data(), input.toUcs4().data(), input.size() * 4);
-            break;
-        default:
-            qCritical("sizeof(SQLTCHAR) is %d. Don't know how to handle this.", int(sizeof(SQLTCHAR)));
-    }
+    toSQLTCHARImpl(result, input);
     result.append(0); // make sure it's null terminated, doesn't matter if it already is, it does if it isn't.
     return result;
 }

--- a/src/plugins/sqldrivers/odbc/qsql_odbc.cpp
+++ b/src/plugins/sqldrivers/odbc/qsql_odbc.cpp
@@ -1740,10 +1740,11 @@ bool QODBCResult::exec()
             case QMetaType::QString:
                 if (d->unicode) {
                     if (bindValueType(i) & QSql::Out) {
-                        const QByteArray &first = tmpStorage.at(i);
-                        QVarLengthArray<SQLTCHAR> array;
-                        array.append((const SQLTCHAR *)first.constData(), first.size());
-                        values[i] = fromSQLTCHAR(array, first.size()/sizeof(SQLTCHAR));
+                        const QByteArray &bytes = tmpStorage.at(i);
+                        const auto strSize = bytes.size() / sizeof(SQLTCHAR);
+                        QVarLengthArray<SQLTCHAR> string(strSize);
+                        memcpy(string.data(), bytes.data(), strSize * sizeof(SQLTCHAR));
+                        values[i] = fromSQLTCHAR(string);
                     }
                     break;
                 }


--- a/src/plugins/sqldrivers/odbc/qsql_odbc.cpp
+++ b/src/plugins/sqldrivers/odbc/qsql_odbc.cpp
@@ -745,6 +745,14 @@ QChar QODBCDriverPrivate::quoteChar()
     return quote;
 }

+static SQLRETURN qt_string_SQLSetConnectAttr(SQLHDBC handle, SQLINTEGER attr, const QString &val)
+{
+    auto encoded = toSQLTCHAR(val);
+    return SQLSetConnectAttr(handle, attr,
+                             encoded.data(),
+                             SQLINTEGER(encoded.size() * sizeof(SQLTCHAR))); // size in bytes
+}
+

 bool QODBCDriverPrivate::setConnectionOptions(const QString& connOpts)
 {
@@ -780,10 +788,7 @@ bool QODBCDriverPrivate::setConnectionOptions(const QString& connOpts)
             v = val.toUInt();
             r = SQLSetConnectAttr(hDbc, SQL_ATTR_LOGIN_TIMEOUT, (SQLPOINTER) size_t(v), 0);
         } else if (opt.toUpper() == "SQL_ATTR_CURRENT_CATALOG"_L1) {
-            val.utf16(); // 0 terminate
-            r = SQLSetConnectAttr(hDbc, SQL_ATTR_CURRENT_CATALOG,
-                                    toSQLTCHAR(val).data(),
-                                    SQLINTEGER(val.length() * sizeof(SQLTCHAR)));
+            r = qt_string_SQLSetConnectAttr(hDbc, SQL_ATTR_CURRENT_CATALOG, val);
         } else if (opt.toUpper() == "SQL_ATTR_METADATA_ID"_L1) {
             if (val.toUpper() == "SQL_TRUE"_L1) {
                 v = SQL_TRUE;
@@ -798,10 +803,7 @@ bool QODBCDriverPrivate::setConnectionOptions(const QString& connOpts)
             v = val.toUInt();
             r = SQLSetConnectAttr(hDbc, SQL_ATTR_PACKET_SIZE, (SQLPOINTER) size_t(v), 0);
         } else if (opt.toUpper() == "SQL_ATTR_TRACEFILE"_L1) {
-            val.utf16(); // 0 terminate
-            r = SQLSetConnectAttr(hDbc, SQL_ATTR_TRACEFILE,
-                                    toSQLTCHAR(val).data(),
-                                    SQLINTEGER(val.length() * sizeof(SQLTCHAR)));
+            r = qt_string_SQLSetConnectAttr(hDbc, SQL_ATTR_TRACEFILE, val);
         } else if (opt.toUpper() == "SQL_ATTR_TRACE"_L1) {
             if (val.toUpper() == "SQL_OPT_TRACE_OFF"_L1) {
                 v = SQL_OPT_TRACE_OFF;
@@ -1004,9 +1006,12 @@ bool QODBCResult::reset (const QString& query)
         return false;
     }

-    r = SQLExecDirect(d->hStmt,
-                       toSQLTCHAR(query).data(),
-                       (SQLINTEGER) query.length());
+    {
+        auto encoded = toSQLTCHAR(query);
+        r = SQLExecDirect(d->hStmt,
+                          encoded.data(),
+                          SQLINTEGER(encoded.size()));
+    }
     if (r != SQL_SUCCESS && r != SQL_SUCCESS_WITH_INFO && r!= SQL_NO_DATA) {
         setLastError(qMakeError(QCoreApplication::translate("QODBCResult",
                      "Unable to execute statement"), QSqlError::StatementError, d));
@@ -1355,9 +1360,12 @@ bool QODBCResult::prepare(const QString& query)
         return false;
     }

-    r = SQLPrepare(d->hStmt,
-                    toSQLTCHAR(query).data(),
-                    (SQLINTEGER) query.length());
+    {
+        auto encoded = toSQLTCHAR(query);
+        r = SQLPrepare(d->hStmt,
+                       encoded.data(),
+                       SQLINTEGER(encoded.size()));
+    }

     if (r != SQL_SUCCESS) {
         setLastError(qMakeError(QCoreApplication::translate("QODBCResult",
@@ -1385,7 +1393,7 @@ bool QODBCResult::exec()
         SQLCloseCursor(d->hStmt);

     QVariantList &values = boundValues();
-    QByteArrayList tmpStorage(values.count(), QByteArray()); // holds temporary buffers
+    QByteArrayList tmpStorage(values.count(), QByteArray()); // targets for SQLBindParameter()
     QVarLengthArray<SQLLEN, 32> indicators(values.count());
     memset(indicators.data(), 0, indicators.size() * sizeof(SQLLEN));

@@ -1600,36 +1608,36 @@ bool QODBCResult::exec()
             case QMetaType::QString:
                 if (d->unicode) {
                     QByteArray &ba = tmpStorage[i];
-                    QString str = val.toString();
+                    {
+                        const auto encoded = toSQLTCHAR(val.toString());
+                        ba = QByteArray(reinterpret_cast<const char *>(encoded.data()),
+                                        encoded.size() * sizeof(SQLTCHAR));
+                    }
+
                     if (*ind != SQL_NULL_DATA)
-                        *ind = str.length() * sizeof(SQLTCHAR);
-                    const qsizetype strSize = str.length() * sizeof(SQLTCHAR);
+                        *ind = ba.size();

                     if (bindValueType(i) & QSql::Out) {
-                        const QVarLengthArray<SQLTCHAR> a(toSQLTCHAR(str));
-                        ba = QByteArray((const char *)a.constData(), int(a.size() * sizeof(SQLTCHAR)));
                         r = SQLBindParameter(d->hStmt,
                                             i + 1,
                                             qParamType[bindValueType(i) & QSql::InOut],
                                             SQL_C_TCHAR,
-                                            strSize > 254 ? SQL_WLONGVARCHAR : SQL_WVARCHAR,
+                                            ba.size() > 254 ? SQL_WLONGVARCHAR : SQL_WVARCHAR,
                                             0, // god knows... don't change this!
                                             0,
-                                            ba.data(),
+                                            const_cast<char *>(ba.constData()), // don't detach
                                             ba.size(),
                                             ind);
                         break;
                     }
-                    ba = QByteArray(reinterpret_cast<const char *>(toSQLTCHAR(str).constData()),
-                                    int(strSize));
                     r = SQLBindParameter(d->hStmt,
                                           i + 1,
                                           qParamType[bindValueType(i) & QSql::InOut],
                                           SQL_C_TCHAR,
-                                          strSize > 254 ? SQL_WLONGVARCHAR : SQL_WVARCHAR,
-                                          strSize,
+                                          ba.size() > 254 ? SQL_WLONGVARCHAR : SQL_WVARCHAR,
+                                          ba.size(),
                                           0,
-                                          const_cast<char *>(ba.constData()),
+                                          const_cast<char *>(ba.constData()), // don't detach
                                           ba.size(),
                                           ind);
                     break;
@@ -1991,14 +1999,16 @@ bool QODBCDriver::open(const QString & db,
     SQLSMALLINT cb;
     QVarLengthArray<SQLTCHAR> connOut(1024);
     memset(connOut.data(), 0, connOut.size() * sizeof(SQLTCHAR));
-    r = SQLDriverConnect(d->hDbc,
-                          NULL,
-                          toSQLTCHAR(connQStr).data(),
-                          (SQLSMALLINT)connQStr.length(),
-                          connOut.data(),
-                          1024,
-                          &cb,
-                          /*SQL_DRIVER_NOPROMPT*/0);
+    {
+        auto encoded = toSQLTCHAR(connQStr);
+        r = SQLDriverConnect(d->hDbc,
+                             nullptr,
+                             encoded.data(), SQLSMALLINT(encoded.size()),
+                             connOut.data(),
+                             1024,
+                             &cb,
+                             /*SQL_DRIVER_NOPROMPT*/0);
+    }

     if (r != SQL_SUCCESS && r != SQL_SUCCESS_WITH_INFO) {
         setLastError(qMakeError(tr("Unable to connect"), QSqlError::ConnectionError, d));
@@ -2377,17 +2387,15 @@ QStringList QODBCDriver::tables(QSql::TableType type) const
     if (tableType.isEmpty())
         return tl;

-    QString joinedTableTypeString = tableType.join(u',');
+    {
+        auto joinedTableTypeString = toSQLTCHAR(tableType.join(u','));

-    r = SQLTables(hStmt,
-                   NULL,
-                   0,
-                   NULL,
-                   0,
-                   NULL,
-                   0,
-                   toSQLTCHAR(joinedTableTypeString).data(),
-                   joinedTableTypeString.length() /* characters, not bytes */);
+        r = SQLTables(hStmt,
+                      nullptr, 0,
+                      nullptr, 0,
+                      nullptr, 0,
+                      joinedTableTypeString.data(), joinedTableTypeString.size());
+    }

     if (r != SQL_SUCCESS)
         qSqlWarning("QODBCDriver::tables Unable to execute table list"_L1, d);
@@ -2460,28 +2468,30 @@ QSqlIndex QODBCDriver::primaryIndex(const QString& tablename) const
                         SQL_ATTR_CURSOR_TYPE,
                         (SQLPOINTER)SQL_CURSOR_FORWARD_ONLY,
                         SQL_IS_UINTEGER);
-    r = SQLPrimaryKeys(hStmt,
-                        catalog.length() == 0 ? NULL : toSQLTCHAR(catalog).data(),
-                        catalog.length(),
-                        schema.length() == 0 ? NULL : toSQLTCHAR(schema).data(),
-                        schema.length(),
-                        toSQLTCHAR(table).data(),
-                        table.length() /* in characters, not in bytes */);
+    {
+        auto c = toSQLTCHAR(catalog);
+        auto s = toSQLTCHAR(schema);
+        auto t = toSQLTCHAR(table);
+        r = SQLPrimaryKeys(hStmt,
+                           catalog.isEmpty() ? nullptr : c.data(), c.size(),
+                           schema.isEmpty()  ? nullptr : s.data(), s.size(),
+                           t.data(), t.size());
+    }

     // if the SQLPrimaryKeys() call does not succeed (e.g the driver
     // does not support it) - try an alternative method to get hold of
     // the primary index (e.g MS Access and FoxPro)
     if (r != SQL_SUCCESS) {
-            r = SQLSpecialColumns(hStmt,
-                        SQL_BEST_ROWID,
-                        catalog.length() == 0 ? NULL : toSQLTCHAR(catalog).data(),
-                        catalog.length(),
-                        schema.length() == 0 ? NULL : toSQLTCHAR(schema).data(),
-                        schema.length(),
-                        toSQLTCHAR(table).data(),
-                        table.length(),
-                        SQL_SCOPE_CURROW,
-                        SQL_NULLABLE);
+        auto c = toSQLTCHAR(catalog);
+        auto s = toSQLTCHAR(schema);
+        auto t = toSQLTCHAR(table);
+        r = SQLSpecialColumns(hStmt,
+                              SQL_BEST_ROWID,
+                              catalog.isEmpty() ? nullptr : c.data(), c.size(),
+                              schema.isEmpty()  ? nullptr : s.data(), s.size(),
+                              t.data(), t.size(),
+                              SQL_SCOPE_CURROW,
+                              SQL_NULLABLE);

             if (r != SQL_SUCCESS) {
                 qSqlWarning("QODBCDriver::primaryIndex: Unable to execute primary key list"_L1, d);
@@ -2562,15 +2572,17 @@ QSqlRecord QODBCDriver::record(const QString& tablename) const
                         SQL_ATTR_CURSOR_TYPE,
                         (SQLPOINTER)SQL_CURSOR_FORWARD_ONLY,
                         SQL_IS_UINTEGER);
-    r =  SQLColumns(hStmt,
-                     catalog.length() == 0 ? NULL : toSQLTCHAR(catalog).data(),
-                     catalog.length(),
-                     schema.length() == 0 ? NULL : toSQLTCHAR(schema).data(),
-                     schema.length(),
-                     toSQLTCHAR(table).data(),
-                     table.length(),
-                     NULL,
-                     0);
+    {
+        auto c = toSQLTCHAR(catalog);
+        auto s = toSQLTCHAR(schema);
+        auto t = toSQLTCHAR(table);
+        r =  SQLColumns(hStmt,
+                        catalog.isEmpty() ? nullptr : c.data(), c.size(),
+                        schema.isEmpty()  ? nullptr : s.data(), s.size(),
+                        t.data(), t.size(),
+                        nullptr,
+                        0);
+    }
     if (r != SQL_SUCCESS)
         qSqlWarning("QODBCDriver::record: Unable to execute column list"_L1, d);