Serhiy Storchaka added the comment:
readline() is used only when unpickle opcodes PERSID, INT, LONG, FLOAT, STRING,
UNICODE, INST, GLOBAL, GET, PUT. These opcodes are not used with protocol 4
(all opcodes except GLOBAL is used only with protocol 0, and GLOBAL is used
with protocol <= 3). Frames are used only with protocol 4. So there is very
small chance to meet this bug in real data. But it is not zero, artificial
pickled data which mixes FRAME with protocol 0 opcodes can be constructed by
third-party software for some reasons.
Artificial example:
>>> pickletools.dis(b"\x80\x04\x95\x05\x00\x00\x00\x00\x00\x00\x00I42\n.")
0: \x80 PROTO 4
2: \x95 FRAME 5
11: I INT 42
15: . STOP
highest protocol among opcodes = 4
----------
components: +Library (Lib)
stage: -> needs patch
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue23094>
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