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Nick Mathewson
9b5a19c64b
For a brief moment in networkstatus_set_current_consensus(), the old consensus has been freed, but the node_t objects still have dead pointers to the routerstatus_t objects within it. During that interval, we absolutely must not do anything that would cause Tor to look at those dangling pointers. Unfortunately, calling the (badly labeled!) current_consensus macro or anything else that calls into we_use_microdescriptors_for_circuits(), can make us look at the nodelist. The fix is to make sure we identify the main consensus flavor _outside_ the danger zone, and to make the danger zone much much smaller. Fixes bug 20103. This bug has been implicitly present for AGES; we just got lucky for a very long time. It became a crash bug in 0.2.8.2-alpha when we merged35bbf2e4a4to make find_dl_schedule start looking at the consensus, and4460feaf28which made node_get_all_orports less (accidentally) tolerant of nodes with a valid ri pointer but dangling rs pointer.
Tor protects your privacy on the internet by hiding the connection
between your Internet address and the services you use. We believe Tor
is reasonably secure, but please ensure you read the instructions and
configure it properly.
To build Tor from source:
./configure && make && make install
To build Tor from a just-cloned git repository:
sh autogen.sh && ./configure && make && make install
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