commit b34279d3ab2bae2a1393427e0866da018cf8b678 Author: Nick Mathewson <nickm@torproject.org> Date: Mon Jul 8 11:35:06 2013 -0400 Add a comment and a check for why flag indices will be <= 63 --- src/or/dirvote.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/src/or/dirvote.c b/src/or/dirvote.c index 7537fb8..e0af66e 100644 --- a/src/or/dirvote.c +++ b/src/or/dirvote.c @@ -1590,10 +1590,19 @@ networkstatus_compute_consensus(smartlist_t *votes, unnamed_flag[i] = named_flag[i] = -1; chosen_named_idx = smartlist_string_pos(flags, "Named"); - /* Build the flag index. */ + /* Build the flag indexes. Note that no vote can have more than 64 members + * for known_flags, so no value will be greater than 63, so it's safe to + * do U64_LITERAL(1) << index on these values. But note also that + * named_flag and unnamed_flag are initialized to -1, so we need to check + * that they're actually set before doing U64_LITERAL(1) << index with + * them.*/ SMARTLIST_FOREACH_BEGIN(votes, networkstatus_t *, v) { flag_map[v_sl_idx] = tor_malloc_zero( sizeof(int)*smartlist_len(v->known_flags)); + if (smartlist_len(v->known_flags) > MAX_KNOWN_FLAGS_IN_VOTE) { + log_warn(LD_BUG, "Somehow, a vote has %d entries in known_flags", + smartlist_len(v->known_flags)); + } SMARTLIST_FOREACH_BEGIN(v->known_flags, const char *, fl) { int p = smartlist_string_pos(flags, fl); tor_assert(p >= 0);