[tor-commits] [tor/master] Defensive programming: clear rs_out between iterations.

[nickm at torproject.org]

commit 2d6d5db2fe4f8a4538c5bed903f7e1576e9eea40
Author: Nick Mathewson <nickm at torproject.org>
Date:   Wed Aug 1 17:25:34 2012 -0400

    Defensive programming: clear rs_out between iterations.
    
    I can't currently find a bug here, but there are a couple of
    near-misses.  Addresses ticket 6514; reported pseudonymously on
    IRC.
---
 changes/bug6514  |    5 +++++
 src/or/dirvote.c |    1 +
 2 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/changes/bug6514 b/changes/bug6514
new file mode 100644
index 0000000..84633bd
--- /dev/null
+++ b/changes/bug6514
@@ -0,0 +1,5 @@
+  o Minor bugfixes:
+    - Add a (probably redundant) memory clear between iterations of
+      the router status voting loop, to prevent future coding errors
+      where data might leak between iterations of the loop. Resolves
+      ticket 6514.
diff --git a/src/or/dirvote.c b/src/or/dirvote.c
index 7995873..bc77973 100644
--- a/src/or/dirvote.c
+++ b/src/or/dirvote.c
@@ -1752,6 +1752,7 @@ networkstatus_compute_consensus(smartlist_t *votes,
       rs = compute_routerstatus_consensus(matching_descs, consensus_method,
                                           microdesc_digest);
       /* Copy bits of that into rs_out. */
+      memset(&rs_out, 0, sizeof(rs_out));
       tor_assert(fast_memeq(lowest_id, rs->status.identity_digest,DIGEST_LEN));
       memcpy(rs_out.identity_digest, lowest_id, DIGEST_LEN);
       memcpy(rs_out.descriptor_digest, rs->status.descriptor_digest,