Shannon Booth 5f5975c81d LibWeb/HTML: Iterate safely in perform_a_microtask_checkpoint() ...

This list we are iterating over is removed from when there are
no more GC references to an ESO. This may be triggered by a GC
allocation. Since
UniversalGlobalScopeMixin::notify_about_rejected_promises performs
GC allocations (by, for example, allocating a GC function), it
is not safe to simply iterate over this list.

Fix this by taking a strong reference to all registered ESOs by
copying them across to a RootVector before iteration.

Fixes: #4652

2025-06-18 13:08:30 +02:00

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