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Auto merge of #15083 - potocpav:issue-14497, r=KiChjang

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Fix #14497: WeakMediaQueryListVec assumes its contents are still alive

<!-- Please describe your changes on the following line: -->
First time contributor here. Noticed this issue is easily solved, so I did it. I am very unsure about how things work here: Is a test needed? What should it look like? Should the "unwrap" be avoided (making bigger changes to the code)?

---
<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `__` with appropriate data: -->
- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [X] These changes fix #14497  (github issue number if applicable).

- [X] There are tests for these changes

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This commit is contained in:
bors-servo 2017-01-19 14:10:33 -08:00 • committed by GitHub
commit 29d4f7d467
3 changed files with 21 additions and 2 deletions
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4
components/script/dom/mediaquerylist.rs
View file

@ -138,7 +138,7 @@ impl WeakMediaQueryListVec {
/// Evaluate media query lists and report changes
/// https://drafts.csswg.org/cssom-view/#evaluate-media-queries-and-report-changes
pub fn evaluate_and_report_changes(&self) {
for mql in self.cell.borrow().iter() {
self.cell.borrow_mut().update(|mql| {
let mql = mql.root().unwrap();
if let MediaQueryListMatchState::Changed(_) = mql.evaluate_changes() {
let event = MediaQueryListEvent::new(&mql.global(),
@ -148,7 +148,7 @@ impl WeakMediaQueryListVec {
mql.Matches());
event.upcast::<Event>().fire(mql.upcast::<EventTarget>());
}
}
});
}
}

6
tests/wpt/mozilla/meta/MANIFEST.json
View file

@ -8594,6 +8594,12 @@
"url": "/_mozilla/mozilla/localeCompare.html"
}
],
"mozilla/media_query_list_gc.html": [
{
"path": "mozilla/media_query_list_gc.html",
"url": "/_mozilla/mozilla/media_query_list_gc.html"
}
],
"mozilla/mime_sniffing_font_context.html": [
{
"path": "mozilla/mime_sniffing_font_context.html",

13
tests/wpt/mozilla/tests/mozilla/media_query_list_gc.html Normal file
View file

@ -0,0 +1,13 @@
<!doctype html>
<meta charset="utf-8">
<title>Should not crash on the resize</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
test(function() {
var mql = matchMedia("(min-width: 1000px)");
mql = null;
gc();
window.resizeBy(1,1);
})
</script>