Fix GH-20856: heap-use-after-free in SplDoublyLinkedList iterator when modifying during iteration #20885
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…when modifying during iteration The element may be still in use in other places, so the linking pointers should be kept consistent. If not consistent, the "move forward" code in the sample test will read a stale, dangling pointer.
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The element may be still in use in other places, so the linking pointers should be kept consistent. If not consistent, the "move forward" code in the sample test will read a stale, dangling pointer.