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config: fix panic in PrefValue to [f64; 4] conversion (#32571)

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The `Iterator::all` method consumes the input iterator `f` so when
we reuse `f` in `f.flatten().collect()` it yields an empty Vector
in the case where all the elements are successfully converted using
try_into(). This causes out of bounds access when indexing into
the resulting Vector to extract the individual components.

Fixes #32570.

Signed-off-by: Mukilan Thiyagarajan <mukilan@igalia.com>
This commit is contained in:
Mukilan Thiyagarajan 2024-06-20 14:17:13 +05:30 • committed by GitHub
parent 64b872ec0d
commit ee2acaeacf
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1 changed files with 5 additions and 3 deletions
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8
components/config/pref_util.rs
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@ -158,9 +158,11 @@ impl From<PrefValue> for [f64; 4] {
fn from(other: PrefValue) -> [f64; 4] {
match other {
PrefValue::Array(values) if values.len() == 4 => {
let mut f = values.into_iter().map(|v| v.try_into());
if f.all(|v| v.is_ok()) {
let f = f.flatten().collect::<Vec<f64>>();
let f = values
.into_iter()
.filter_map(|v| v.try_into().ok())
.collect::<Vec<f64>>();
if f.len() == 4 {
[f[0], f[1], f[2], f[3]]
} else {
panic!(