Luke Wilde c8fa0c3cd7 LibWeb: Hold a strong ref to old_rule in CSSRuleList::remove_a_css_rule ...

Using auto& when indexing an NNRPVector doesn't cause it to hold a
strong reference and is instead just a plain old reference.

If m_rules was the only storage holding a strong reference to old_rule,
we would remove it in step 4 and subsequently UAF it in step 5.

2022-06-11 19:27:09 +01:00

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