iconvdata/ibm930.c in GNU C Library (aka glibc) before 2.16 allows context-dependent attackers to cause a denial of service (out-of-bounds read) via a multibyte character value of "0xffff" to the iconv function when converting IBM930 encoded data to UTF-8.
https://security.gentoo.org/glsa/201503-04
https://sourceware.org/bugzilla/show_bug.cgi?id=14134
https://sourceware.org/git/?p=glibc.git%3Ba=commit%3Bh=6e230d11837f3ae7b375ea69d7905f0d18eb79e5
http://www.debian.org/security/2015/dsa-3142
http://www.openwall.com/lists/oss-security/2014/08/29/3