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Fix out of bounds access by checking length equality BEFORE accessing by index.

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Fixes #5780
This commit is contained in:
Matthias Krüger 2020-07-11 12:28:21 +02:00
parent be88122039
commit 1b3bc16533
1 changed files with 2 additions and 2 deletions
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4
clippy_lints/src/unnested_or_patterns.rs
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@ -400,8 +400,8 @@ fn extend_with_matching(
/// Are the patterns in `ps1` and `ps2` equal save for `ps1[idx]` compared to `ps2[idx]`?
fn eq_pre_post(ps1: &[P<Pat>], ps2: &[P<Pat>], idx: usize) -> bool {
ps1[idx].is_rest() == ps2[idx].is_rest() // Avoid `[x, ..] | [x, 0]` => `[x, .. | 0]`.
&& ps1.len() == ps2.len()
ps1.len() == ps2.len()
&& ps1[idx].is_rest() == ps2[idx].is_rest() // Avoid `[x, ..] | [x, 0]` => `[x, .. | 0]`.
&& over(&ps1[..idx], &ps2[..idx], |l, r| eq_pat(l, r))
&& over(&ps1[idx + 1..], &ps2[idx + 1..], |l, r| eq_pat(l, r))
}