http://downloads.digium.com/pub/security/AST-2017-001.html
CDR: Protect from data overflow in ast_cdr_setuserfield.
ast_cdr_setuserfield wrote to a fixed length field using strcpy.
This could result in a buffer overrun when called from chan_sip or
func_cdr. This patch adds a maximum bytes written to the field by using
ast_copy_string instead.
93733b5c4f