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Undefined behavior in`struct.unpack` #96735

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Undefined behavior instruct.unpack#96735

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mdickinson

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3.10only security fixes3.11only security fixes3.12only security fixesextension-modulesC modules in the Modules dirtype-bugAn unexpected behavior, bug, or errortype-crashA hard crash of the interpreter, possibly with a core dump

@kumaraditya303

Description

@kumaraditya303

opened

on Sep 10, 2022

Reproducer:

importstructstruct.unpack('!q',b'\xff\xff\xff\xff\xff\xff\xff\xff')

Error:

Modules/_struct.c:842:15: runtime error: left shift of 72057594037927935 by 8 places cannot be represented in type 'long long int'

Compiler options:

./configure -C --with-pydebug --with-address-sanitizer --with-undefined-behavior-sanitizer

Python version:Python 3.12.0a0 (heads/main:30cc1901efa, Sep 10 2022, 10:14:58) [GCC 9.4.0] on linux

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mdickinson

Labels

3.10only security fixes3.11only security fixes3.12only security fixesextension-modulesC modules in the Modules dirtype-bugAn unexpected behavior, bug, or errortype-crashA hard crash of the interpreter, possibly with a core dump

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