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Auto merge of #17347 - duckinator:fix-issue-17319, r=mbrubeck

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Fix setting img src before window.onload causing panic

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Setting an image source asynchronously (e.g. using `setTimeout` or in the callback of an `XMLHttpRequest`) before `window.onload` fired would cause a panic due to a preexisting load blocker not being terminated before assigning a new one.

This PR fixes that and adds a test for it.

---
<!-- 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 #17319.

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- [x] There are tests for these changes

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This commit is contained in:
bors-servo 2017-06-15 16:58:20 -07:00 • committed by GitHub
commit 04935de3ea
3 changed files with 26 additions and 0 deletions
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1
components/script/dom/htmlimageelement.rs
View file

@ -493,6 +493,7 @@ impl HTMLImageElement {
request.image = None;
request.metadata = None;
let document = document_from_node(self);
LoadBlocker::terminate(&mut request.blocker);
request.blocker = Some(LoadBlocker::new(&*document, LoadType::Image(url.clone())));
}

10
tests/wpt/mozilla/meta/MANIFEST.json
View file

@ -13193,6 +13193,12 @@
{}
]
],
"mozilla/img_async_src_set_before_window_load.html": [
[
"/_mozilla/mozilla/img_async_src_set_before_window_load.html",
{}
]
],
"mozilla/img_find_non_sibling_map.html": [
[
"/_mozilla/mozilla/img_find_non_sibling_map.html",
@ -25862,6 +25868,10 @@
"3c4f36abed83367c851d943b1f25b8394de6fe75",
"testharness"
],
"mozilla/img_async_src_set_before_window_load.html": [
"c7895fe3b7b7f11a4853760e386e12a08bb51b96",
"testharness"
],
"mozilla/img_find_non_sibling_map.html": [
"d34100c4cc22adcaa1014095ba4b7b929b8e079d",
"testharness"

15
tests/wpt/mozilla/tests/mozilla/img_async_src_set_before_window_load.html Normal file
View file

@ -0,0 +1,15 @@
<!doctype html>
<meta charset="utf-8">
<title>Shouldn't panic when setting src attribute on img asynchronously before window.onload.</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<img id="image" src="#">
<script>
async_test(function(t) {
image = document.getElementById('image');
setTimeout(t.step_func_done(function() {
image.src = 'test.png';
}), 0);
}, "Setting src attribute asynchronously on image before window.onload doesn't panic.");
</script>