[issue43909] Fuzz dis module and find crashes for dis.dis(), dis.get_instructions() dis.show_code()

[Xinmeng Xia]

New submission from Xinmeng Xia <xiaxm at smail.nju.edu.cn>:

We write a fuzz tool to fuzz Python standard libraries, and find three crashes: dis.dis(),  dis.get_instructions() dis.show_code() in dis module. 


dis.dis()
==========================================
xiaxinmeng:~ xiaxinmeng$ python3.10
Python 3.10.0a3 (v3.10.0a3:8bae2a958e, Dec  7 2020, 15:31:51) 
[Clang 12.0.0 (clang-1200.0.32.27)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import dis
>>> dis.dis("s%-yPdrns"*1000000)
Segmentation fault: 11
=================================================


dis.get_instructions()
=================================================
Python 3.10.0a3 (v3.10.0a3:8bae2a958e, Dec  7 2020, 15:31:51) 
[Clang 12.0.0 (clang-1200.0.32.27)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import dis
>>> dis.get_instructions("c/f/x"*1000000)
Segmentation fault: 11
==================================================


dis.show_code()
===================================================
Python 3.10.0a3 (v3.10.0a3:8bae2a958e, Dec  7 2020, 15:31:51) 
[Clang 12.0.0 (clang-1200.0.32.27)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import dis
>>> dis.show_code("G/7/K"*1000000)
Segmentation fault: 11
====================================================

----------
components: Library (Lib)
messages: 391574
nosy: xxm
priority: normal
severity: normal
status: open
title: Fuzz dis module and find crashes for dis.dis(),  dis.get_instructions() dis.show_code()
type: crash
versions: Python 3.10

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue43909>
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