musl: arbitrary code execution

A stack-based buffer overflow has been found in musl libc’s ipv6 address
literal parsing code. Programs which call the inet_pton or getaddrinfo
function with AF_INET6 or AF_UNSPEC and untrusted address strings are
affected. Successful exploitation yields control of the return address.
Having enabled stack protector at the application level does not
mitigate the issue.