kernel: block: floppy: privilege escalation via FDRAWCMD floppy ioctl command

A flaw was found in the way the Linux kernel's floppy driver handled user space provided data in certain error code paths while processing FDRAWCMD IOCTL commands. A local user with write access to /dev/fdX could use this flaw to free using the kfree function arbitrary kernel memory. CVE-2014-173...