Stack-based buffer overflow in the hfs_mac2asc function in fs/hfs/trans.c in the Linux kernel 2.6 allows local users to cause a denial of service (crash) and possibly execute arbitrary code via an HFS image with a crafted len field.
https://lkml.org/lkml/2011/11/9/303
https://bugzilla.redhat.com/show_bug.cgi?id=755431
http://www.securityfocus.com/bid/50750