QMap: fix UB (invalid cast) in QMapData::end()

The end() pointer, like in all other containers, is a sentinel value
that must never be dereferenced. But unlike array-based containers,
end() in QMap is not "last element plus one", but points to a base class
of Node, not a full Node.

Therefore, the casting from QMapNodeBase to QMapNode must not be a
static_cast, reinterpret_cast is required.

libstdc++-v3's red-black tree had the exact same problem:
 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60734

Change-Id: I43f05fedf0b44314a2dafffd14b33697861ae589
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>

0 files changed, 0 insertions, 0 deletions