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FIx undefined behavior in dirvote.c

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Fix a bug in the voting algorithm that could yield incorrect results
 when a non-naming authority declared too many flags. Fixes bug 9200;
 bugfix on 0.2.0.3-alpha.

Found by coverity scan.
This commit is contained in:
Nick Mathewson 2013-07-03 12:01:37 -04:00
parent 81a5ee77ec
commit 15cd79f832
2 changed files with 7 additions and 1 deletions
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5
changes/bug9200 Normal file
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@ -0,0 +1,5 @@
o Major bugfixes:
- Fix a bug in the voting algorithm that could yield incorrect results
when a non-naming authority declared too many flags. Fixes bug 9200;
bugfix on 0.2.0.3-alpha.

3
src/or/dirvote.c
View File

@ -1727,7 +1727,8 @@ networkstatus_compute_consensus(smartlist_t *votes,
if (rs->flags & (U64_LITERAL(1) << i))
++flag_counts[flag_map[v_sl_idx][i]];
}
if (rs->flags & (U64_LITERAL(1) << named_flag[v_sl_idx])) {
if (named_flag[v_sl_idx] >= 0 &&
(rs->flags & (U64_LITERAL(1) << named_flag[v_sl_idx]))) {
if (chosen_name && strcmp(chosen_name, rs->status.nickname)) {
log_notice(LD_DIR, "Conflict on naming for router: %s vs %s",
chosen_name, rs->status.nickname);