tor/changes/trove-2018-004

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o Minor bugfixes (denial-of-service):
- Fix a possible crash on malformed consensus. If a consensus had
contained an unparseable protocol line, it could have made clients
and relays crash with a null-pointer exception. To exploit this
issue, however, an attacker would need to be able to subvert the
directory-authority system. Fixes bug 25251; bugfix on
0.2.9.4-alpha. Also tracked as TROVE-2018-004.