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Bug 1396620 - Part 2: Fix compartment mismatch crash when doing old prototype swizzling for custom element

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Tag UXP Issue #1344
This commit is contained in:
Gaming4JC 2020-01-20 19:50:19 -05:00 • committed by Roy Tam
commit 3639f0e2bd
1 changed files with 4 additions and 0 deletions
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4
dom/base/Element.cpp
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@ -482,6 +482,10 @@ Element::WrapObject(JSContext *aCx, JS::Handle<JSObject*> aGivenProto)
data->GetCustomElementType(), &customProto);
if (customProto &&
NodePrincipal()->SubsumesConsideringDomain(nsContentUtils::ObjectPrincipal(customProto))) {
// The custom element prototype could be in different compartment.
if (!JS_WrapObject(aCx, &customProto)) {
return nullptr;
}
// Just go ahead and create with the right proto up front. Set
// customProto to null to flag that we don't need to do any post-facto
// proto fixups here.