The hfs_find_init function in the Linux kernel 2.6 allows local users to cause a denial of service (NULL pointer dereference and Oops) by mounting an HFS file system with a malformed MDB extent record.
https://bugzilla.redhat.com/show_bug.cgi?id=712774
http://secunia.com/advisories/47754
http://www.openwall.com/lists/oss-security/2011/06/13/16
http://www.ubuntu.com/usn/USN-1324-1