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Avoid UB in PySlice::indices 

Mutating a variables that is not declared with `mut` is undefined
behavior.
This commit is contained in:
Amanieu d'Antras 2021-12-20 18:28:36 +01:00
parent c7ca8bb017
commit 1fb20dab91
1 changed files with 8 additions and 8 deletions
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16
src/types/slice.rs
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@ -57,17 +57,17 @@ impl PySlice {
pub fn indices(&self, length: c_long) -> PyResult<PySliceIndices> {
// non-negative Py_ssize_t should always fit into Rust usize
unsafe {
let slicelength: isize = 0;
let start: isize = 0;
let stop: isize = 0;
let step: isize = 0;
let mut slicelength: isize = 0;
let mut start: isize = 0;
let mut stop: isize = 0;
let mut step: isize = 0;
let r = ffi::PySlice_GetIndicesEx(
self.as_ptr(),
length as Py_ssize_t,
&start as *const _ as *mut _,
&stop as *const _ as *mut _,
&step as *const _ as *mut _,
&slicelength as *const _ as *mut _,
&mut start,
&mut stop,
&mut step,
&mut slicelength,
);
if r == 0 {
Ok(PySliceIndices {