o Major bugfixes (HTTP, parsing):
    - When parsing a malformed content-length field from an HTTP message,
      do not read off the end of the buffer. This bug was a potential
      remote denial-of-service attack against Tor clients and relays.
      A workaround was released in October 2016, which prevents this
      bug from crashing Tor.  This is a fix for the underlying issue,
      which should no longer matter (if you applied the earlier patch).
      Fixes bug 20894; bugfix on 0.2.0.16-alpha.