boundary check while parsing bint to avoid segfault

Author: Frederick888

src/bint.cc

@@ -33,7 +33,7 @@ zval bint::parse(const std::string &ben, size_t &pt)
     if (ben[pt] != 'i')
         return bitem::throw_general_exception("Error parsing bint");
     size_t start = ++pt;
-    while (ben[pt] != 'e')
+    while (pt < ben.length() && ben[pt] != 'e')
         ++pt;
     long result = std::stoll(ben.substr(start, pt - start));
     ++pt;

tests/non_ending_int.phpt

@@ -0,0 +1,13 @@
+--TEST--
+PHP Bencode - Non-Ending Integer Test
+--FILE--
+<?php
+error_reporting(E_ALL);
+
+$bstr = bitem::parse('i10');
+echo $bstr;
+
+exit(0);
+?>
+--EXPECTF--
+i10e