New submission from STINNER Victor <victor.stin...@gmail.com>:
Coverity found an issue in the commit 2e3f5701858d1fc04caedefdd9a8ea43810270d2
(bpo-30416).
New defect(s) Reported-by: Coverity Scan
Showing 1 of 1 defect(s)
** CID 1426161: Integer handling issues (DIVIDE_BY_ZERO)
/Python/ast_opt.c: 219 in safe_power()
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*** CID 1426161: Integer handling issues (DIVIDE_BY_ZERO)
/Python/ast_opt.c: 219 in safe_power()
213 if (PyLong_Check(v) && PyLong_Check(w) && Py_SIZE(v) && Py_SIZE(w)
> 0) {
214 size_t vbits = _PyLong_NumBits(v);
215 size_t wbits = PyLong_AsSize_t(w);
216 if (vbits == (size_t)-1 || wbits == (size_t)-1) {
217 return NULL;
218 }
>>> CID 1426161: Integer handling issues (DIVIDE_BY_ZERO)
>>> In expression "128UL / wbits", division by expression "wbits" which may
>>> be zero has undefined behavior.
219 if (vbits > MAX_INT_SIZE / wbits) {
220 return NULL;
221 }
222 }
223
224 return PyNumber_Power(v, w, Py_None);
----------
components: Interpreter Core
messages: 308428
nosy: serhiy.storchaka, vstinner
priority: normal
severity: normal
status: open
title: safe_power(): CID 1426161: Integer handling issues (DIVIDE_BY_ZERO)
versions: Python 3.7
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue32342>
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