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LibWeb: Queue a task to proceed after module map entry finishes fetching

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We were doing this synchronously, which was unsafe in that caused us to
re-enter the module map entry setting code while iterating over the
map's entries.

The fix is simply to do what the spec says and queue up a task. This way
the processing gets deferred to a later time.

To avoid stepping into this problem again, I've also added a reentrancy
check in ModuleMap.

This fixes a sporadic crash in HTML::ModuleMap::add() caught by ASAN.
In particular, this was happening regularly on https://shopify.com/
This commit is contained in:
Andreas Kling
2023-12-16 18:32:01 +01:00
parent 2753075830
commit e28ac74e0b
3 changed files with 15 additions and 7 deletions
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8
Userland/Libraries/LibWeb/HTML/Scripting/ModuleMap.cpp
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@@ -47,12 +47,18 @@ Optional<ModuleMap::Entry> ModuleMap::get(AK::URL const& url, DeprecatedString c
AK::HashSetResult ModuleMap::set(AK::URL const& url, DeprecatedString const& type, Entry entry)
{
// NOTE: Re-entering this function while firing wait_for_change callbacks is not allowed.
VERIFY(!m_firing_callbacks);
auto value = m_values.set({ url, type }, entry);
auto callbacks = m_callbacks.get({ url, type });
if (callbacks.has_value())
if (callbacks.has_value()) {
m_firing_callbacks = true;
for (auto const& callback : *callbacks)
callback->function()(entry);
m_firing_callbacks = false;
}
return value;
}