Fix buffer overflow in string radix conversion (#4850)

JerryScript-DCO-1.0-Signed-off-by: Robert Fancsik robert.fancsik@h-lab.eu

tests/jerry/regression-test-issue-4850.js

@@ -0,0 +1,23 @@
+// Copyright JS Foundation and other contributors, http://js.foundation
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+assert(Number('0x10') === 16);
+assert(isNaN(Number('+0x10')));
+assert(isNaN(Number('-0x10')));
+assert(parseFloat('0x10') === 0);
+assert(parseFloat('+0x10') === 0);
+assert(parseFloat('-0x10') === 0);
+assert(0x10 === 16);
+assert(+0x10 === 16);
+assert(-0x10 === -16);