When converting from an array to a map, we double the number of elements, spread the old elements out to make one free slot of space in front of each, and then place Integer values counting from 0 into the free slots. The old code contained a loop that would add a strong reference to the original elements that happen to be containers and thus are ref-counted in the first place. But this additional strong reference is not needed: In both cases, detached or in-place, the detach() call that ensured unique ownership of 'map/dst' will have either directly or indirectly updated the ref-counts of the elements correctly, and the following loops just reshuffle the elements in the QList, they don't create new copies (QtCbor::Elements doesn't by itself manipulate container->ref, but even if it did, the copy would have increased, and the assignment of the Integers would have decreased, the ref-count again). Adding the strong ref without a user then caused the container members to be leaked. Fix by removing the loop. [ChangeLog][QtCore][QCborValue] Fixed a memory leak when an array was coerced into a map. Amends ccea34464075759424e61806c7bc98ee3e658670. Not picking to 6.4 as it's closed at this time. Fixes: QTBUG-115249 Pick-to: 6.6 6.5 Change-Id: I369c372e91c3f0cfe3c65f9b0ea8507d08fdaf48 Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>