dnsmasq -- data exposure and denial of service

Nick Sampanis reported a potential memory exposure and denial of service vulnerability against dnsmasq 2.72. The CVE entry summarizes this as:

The tcp_request function in Dnsmasq before 2.73rc4
does not properly handle the return value of the setup_reply function,
which allows remote attackers to read process memory and cause a
denial of service (out-of-bounds read and crash) via a malformed DNS
request."