Kernel: net: information leak in recvmsg handler msg_name & msg_namelen logic

The mISDNsockrecvmsg function in drivers/isdn/mISDN/socket.c in the Linux kernel before 3.12.4 does not ensure that a certain length value is consistent with the size of an associated data structure, which allows local users to obtain sensitive information from kernel memory via a 1 recvfrom, 2...