Description:
------------
When a out/inout bound parameter is set to a string constant before executing a prepared executed statement, a call to erealloc() on it fails.

Test script:
---------------
<?php
	try {
		$conn = new PDO("odbc:<yourdatabaseDSN>");
	}
	catch (PDOException $e) {
		print "Error!: " . $e->getMessage() . "\n";
		die();
	}

	/* Adjust the SQL statement below to your test environment. */
	$stmt = $conn->prepare("CALL LIBRARY.GETDB(? , ?)");

	$intvalue = 10;
	$strvalue = "abc";
	$stmt->bindParam(1, $intvalue, PDO::PARAM_INT|PDO::PARAM_INPUT_OUTPUT, 4);
	$stmt->bindParam(2, $strvalue, PDO::PARAM_STR|PDO::PARAM_INPUT_OUTPUT, 100);
	print "before execute\n";
	$res = $stmt->execute();
	print "after execute\n";

	var_dump($intvalue);
	var_dump($strvalue);
?>

Expected result:
----------------
Proper execution and normal program exit

Actual result:
--------------
zend_mm_heap corrupted