QCryptographicHash::result() and resultView() are const, therefore two
threads can call them on the same object. Given that the finalization of
the hash is not a trivial operation but doesn't modify the state, let's
do it without a locked mutex, onto a temporary stack buffer. Then we lock
the mutex to copy said result to our cached value.
Pick-to: 6.5 6.4 6.2 5.15
Fixes: QTBUG-110058
Change-Id: Ide4dbd0777a44ed0870efffd17394bf72785eabb
Reviewed-by: Giuseppe D'Angelo <giuseppe.dangelo@kdab.com>
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
ccad719d2e