[issue16216] Arithmetic operations with NULL
Serhiy Storchaka added the comment: Oh, I forgot to mention the issue number in commit messages. There are changeset ad9b5c69b8b6 (for 3.3) and changeset 1f66fc397c8d (for default). -- resolution: - fixed stage: patch review - committed/rejected status: open - closed ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue16216 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue16216] Arithmetic operations with NULL
Changes by Serhiy Storchaka storch...@gmail.com: -- assignee: - serhiy.storchaka ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue16216 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue16216] Arithmetic operations with NULL
Changes by Jesús Cea Avión j...@jcea.es: -- nosy: +jcea ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue16216 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue16216] Arithmetic operations with NULL
Changes by Ezio Melotti ezio.melo...@gmail.com: -- type: - behavior ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue16216 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue16216] Arithmetic operations with NULL
Changes by Serhiy Storchaka storch...@gmail.com: -- stage: - patch review ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue16216 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue16216] Arithmetic operations with NULL
Serhiy Storchaka added the comment: The Standard is not guarantee that result of converting null pointer to integer is zero or even it is a even number. I remember the ancient C implementation, where it was not so (but Python is not supports these platform). Of course, such a method of obtaining aligned pointers is one great trick. I'm not sure whether to worry about that. -- nosy: +mark.dickinson ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue16216 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue16216] Arithmetic operations with NULL
New submission from Serhiy Storchaka: In the function STRINGLIB(fastsearch_memchr_1char) in the file Objects/stringlib/fastsearch.h NULL returned by memchr/memrchr casted to intptr_t, then some arithmetic operations performed on this integer, and result casted back to pointer. I think it is unsafe to do with NULL. The code is easy to rewrite in order to avoid such a questionable operations. -- components: Interpreter Core files: null_align.patch keywords: 3.3regression, patch messages: 172791 nosy: serhiy.storchaka priority: normal severity: normal status: open title: Arithmetic operations with NULL versions: Python 3.3, Python 3.4 Added file: http://bugs.python.org/file27548/null_align.patch ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue16216 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue16216] Arithmetic operations with NULL
STINNER Victor added the comment: I think it is unsafe to do with NULL. Could you please elaborate? -- nosy: +haypo ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue16216 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
