New submission from Christian Heimes: Coverity has found undefined behavior in dtoa.c:d2b(). lo0bits() can return 32 which z >>= 32, where z is an uint32. I've talked to doku at PyCon. He suggested to update dtoa.c to a more recent version. Our copy is based on a version from 2001. There are more modern versions available, e.g. https://searchcode.com/codesearch/view/52748288/ from 2006.
CID 1202735 (#1 of 1): Bad bit shift operation (BAD_SHIFT) large_shift: In expression z >>= k, right shifting by more than 31 bits has undefined behavior. The shift amount, k, is 32. ---------- messages: 241464 nosy: christian.heimes, doko, eric.smith, mark.dickinson, serhiy.storchaka priority: normal severity: normal stage: needs patch status: open title: Undefined behavior in dtoa.c (rshift 32 of 32bit data type) type: behavior versions: Python 2.7, Python 3.3, Python 3.4, Python 3.5 _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue23999> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
