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AK: Clear OrderedHashTable previous/next pointers on removal

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With Clang, the previous/next pointers in buckets of an
`OrderedHashTable` are not cleared when a bucket is being shifted up as
a result of a removed bucket. As a result, an unfortunate pointer mixup
could lead to an infinite loop in the `HashTable` iterator, which was
exposed in `HashMap::keys()`.

Co-authored-by: Luke Wilde <lukew@serenityos.org>
This commit is contained in:
Jelle Raaijmakers 2023-03-15 18:37:55 +01:00
parent d16d805d96
commit 954d660094
2 changed files with 28 additions and 0 deletions
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4
AK/HashTable.h
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@ -690,6 +690,10 @@ private:
auto* shift_to_bucket = &m_buckets[shift_to_index];
*shift_to_bucket = move(*shift_from_bucket);
if constexpr (IsOrdered) {
shift_from_bucket->previous = nullptr;
shift_from_bucket->next = nullptr;
}
shift_to_bucket->state = bucket_state_for_probe_length(shift_from_probe_length - 1);
update_bucket_neighbours(shift_to_bucket);