Apple Mac OSX - OSMetaClassBase::safeMetaCast in IOAccelContext2::connectClient NULL Dereference

/ Source: https://code.google.com/p/google-security-research/issues/detail?id=512 IOUserClient::connectClient is an obscure IOKit method which according to the docs is supposed to "Inform a connection of a second connection." In fact IOKit provides no default implementation and only a handful of...