Fix parseFloat input string length calculation (#3782)

JerryScript-DCO-1.0-Signed-off-by: Peter Gal [email protected]

Author: galpeter

jerry-core/ecma/base/ecma-helpers-number.c

@@ -941,7 +941,7 @@ ecma_number_parse_float (const lit_utf8_byte_t *string_buff, /**< routine's firs
   /* The input string should be at least the length of "Infinity" to be correctly processed as
    * the infinity value.
    */
-  if (string_buff_size >= infinity_length
+  if ((str_end_p - str_curr_p) >= (int) infinity_length
       && memcmp (infinity_str_p, str_curr_p, infinity_length) == 0)
   {
     /* String matched Infinity. */

tests/jerry/regression-test-issue-3778.js

@@ -0,0 +1,15 @@
+// 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 (parseFloat (-0.00001) === -0.00001);