Results of malloc aren't checked for 0 when called from QArrayData::allocate

QArrayData is used as the internal storage for various classes. It allocates its memory with malloc() in qarraydata.cpp:101. If that malloc returns 0 QArrayData::allocate() will return 0, too. This can happen for a variety of reasons, few of which are under the application developer's control. The result of allocate() is used blindly in a variety of places but I can only see one place where it's actually checked for 0, qvector.h:507

All users of QArrayData need to use Q_CHECK_PTR after the allocation to check for nulls and throw if necessary.