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Title: PY_SSIZE_T_MIN negate UB in unicode_format.c and bytesobject.c · Issue #151847 · python/cpython · GitHub

Open Graph Title: PY_SSIZE_T_MIN negate UB in unicode_format.c and bytesobject.c · Issue #151847 · python/cpython

X Title: PY_SSIZE_T_MIN negate UB in unicode_format.c and bytesobject.c · Issue #151847 · python/cpython

Description: Bug report Bug description: Original gist: https://gist.github.com/devdanzin/577421b083bad6802aa391b909d1a725 unicode_format_arg_parse (line 563): -PY_SSIZE_T_MIN is undefined behavior in C. Benign on two's-complement but technically UB....

Open Graph Description: Bug report Bug description: Original gist: https://gist.github.com/devdanzin/577421b083bad6802aa391b909d1a725 unicode_format_arg_parse (line 563): -PY_SSIZE_T_MIN is undefined behavior in C. Benign...

X Description: Bug report Bug description: Original gist: https://gist.github.com/devdanzin/577421b083bad6802aa391b909d1a725 unicode_format_arg_parse (line 563): -PY_SSIZE_T_MIN is undefined behavior in C. Benign...

Opengraph URL: https://github.com/python/cpython/issues/151847

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og:image:altBug report Bug description: Original gist: https://gist.github.com/devdanzin/577421b083bad6802aa391b909d1a725 unicode_format_arg_parse (line 563): -PY_SSIZE_T_MIN is undefined behavior in C. Benign...
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PY_SSIZE_T_MIN negate UB in unicode_format.c and bytesobject.chttps://github.com/python/cpython/issues/151847#top
interpreter-core(Objects, Python, Grammar, and Parser dirs)https://github.com/python/cpython/issues?q=state%3Aopen%20label%3A%22interpreter-core%22
type-bugAn unexpected behavior, bug, or errorhttps://github.com/python/cpython/issues?q=state%3Aopen%20label%3A%22type-bug%22
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on Jun 21, 2026https://github.com/python/cpython/issues/151847#issue-4710777092
https://gist.github.com/devdanzin/577421b083bad6802aa391b909d1a725https://gist.github.com/devdanzin/577421b083bad6802aa391b909d1a725
gh-151847: Avoid undefined behaviour negating PY_SSIZE_T_MIN width in str/bytes formatting #151849https://github.com/python/cpython/pull/151849
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