95 lines
2.3 KiB
Rust
95 lines
2.3 KiB
Rust
#![warn(clippy::uninit_vec)]
|
|
|
|
use std::mem::MaybeUninit;
|
|
|
|
#[derive(Default)]
|
|
struct MyVec {
|
|
vec: Vec<u8>,
|
|
}
|
|
|
|
fn main() {
|
|
// with_capacity() -> set_len() should be detected
|
|
let mut vec: Vec<u8> = Vec::with_capacity(1000);
|
|
unsafe {
|
|
vec.set_len(200);
|
|
}
|
|
|
|
// reserve() -> set_len() should be detected
|
|
vec.reserve(1000);
|
|
unsafe {
|
|
vec.set_len(200);
|
|
}
|
|
|
|
// new() -> set_len() should be detected
|
|
let mut vec: Vec<u8> = Vec::new();
|
|
unsafe {
|
|
vec.set_len(200);
|
|
}
|
|
|
|
// default() -> set_len() should be detected
|
|
let mut vec: Vec<u8> = Default::default();
|
|
unsafe {
|
|
vec.set_len(200);
|
|
}
|
|
|
|
let mut vec: Vec<u8> = Vec::default();
|
|
unsafe {
|
|
vec.set_len(200);
|
|
}
|
|
|
|
// test when both calls are enclosed in the same unsafe block
|
|
unsafe {
|
|
let mut vec: Vec<u8> = Vec::with_capacity(1000);
|
|
vec.set_len(200);
|
|
|
|
vec.reserve(1000);
|
|
vec.set_len(200);
|
|
}
|
|
|
|
let mut vec: Vec<u8> = Vec::with_capacity(1000);
|
|
unsafe {
|
|
// test the case where there are other statements in the following unsafe block
|
|
vec.set_len(200);
|
|
assert!(vec.len() == 200);
|
|
}
|
|
|
|
// handle vec stored in the field of a struct
|
|
let mut my_vec = MyVec::default();
|
|
my_vec.vec.reserve(1000);
|
|
unsafe {
|
|
my_vec.vec.set_len(200);
|
|
}
|
|
|
|
my_vec.vec = Vec::with_capacity(1000);
|
|
unsafe {
|
|
my_vec.vec.set_len(200);
|
|
}
|
|
|
|
// Test `#[allow(...)]` attributes on inner unsafe block (shouldn't trigger)
|
|
let mut vec: Vec<u8> = Vec::with_capacity(1000);
|
|
#[allow(clippy::uninit_vec)]
|
|
unsafe {
|
|
vec.set_len(200);
|
|
}
|
|
|
|
// MaybeUninit-wrapped types should not be detected
|
|
unsafe {
|
|
let mut vec: Vec<MaybeUninit<u8>> = Vec::with_capacity(1000);
|
|
vec.set_len(200);
|
|
|
|
let mut vec: Vec<(MaybeUninit<u8>, MaybeUninit<bool>)> = Vec::with_capacity(1000);
|
|
vec.set_len(200);
|
|
|
|
let mut vec: Vec<(MaybeUninit<u8>, [MaybeUninit<bool>; 2])> = Vec::with_capacity(1000);
|
|
vec.set_len(200);
|
|
}
|
|
|
|
// known false negative
|
|
let mut vec1: Vec<u8> = Vec::with_capacity(1000);
|
|
let mut vec2: Vec<u8> = Vec::with_capacity(1000);
|
|
unsafe {
|
|
vec1.set_len(200);
|
|
vec2.set_len(200);
|
|
}
|
|
}
|