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LibWeb: Hold a strong ref to old_rule in CSSRuleList::remove_a_css_rule

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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.
This commit is contained in:
Luke Wilde 2022-06-11 18:40:06 +01:00 • committed by Linus Groh
parent d2f0a1d9b1
commit c8fa0c3cd7
1 changed files with 3 additions and 4 deletions
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7
Userland/Libraries/LibWeb/CSS/CSSRuleList.cpp
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@ -72,17 +72,16 @@ DOM::ExceptionOr<void> CSSRuleList::remove_a_css_rule(u32 index)
return DOM::IndexSizeError::create("CSS rule index out of bounds.");
// 3. Set old rule to the indexth item in list.
auto& old_rule = m_rules[index];
NonnullRefPtr<CSSRule> old_rule = m_rules[index];
// FIXME: 4. If old rule is an @namespace at-rule, and list contains anything other than @import at-rules, and @namespace at-rules, throw an InvalidStateError exception.
(void)old_rule;
// 5. Remove rule old rule from list at the zero-indexed position index.
m_rules.remove(index);
// 6. Set old rule’s parent CSS rule and parent CSS style sheet to null.
old_rule.set_parent_rule(nullptr);
old_rule.set_parent_style_sheet(nullptr);
old_rule->set_parent_rule(nullptr);
old_rule->set_parent_style_sheet(nullptr);
return {};
}