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authorNick Mathewson <nickm@torproject.org>2014-06-01 14:02:55 -0400
committerNick Mathewson <nickm@torproject.org>2014-06-01 14:05:10 -0400
commitd9564d528514442e73221d8fbc3044856a2010a9 (patch)
tree8e59643a7830de207ed04b00026e493b0b0ac54a /src/or
parentbe9058003da9b75abbf0403743e7631dc29ba27c (diff)
downloadtor-d9564d528514442e73221d8fbc3044856a2010a9.tar
tor-d9564d528514442e73221d8fbc3044856a2010a9.tar.gz
Use uint32 !=, not tor_memneq, for relay cell integrity checking
tor_memeq has started to show up on profiles, and this is one of the most frequent callers of that function, appearing as it does on every cell handled for entry or exit. 59f9097d5c3dc010847c359888d31757d1c97904 introduced tor_memneq here; it went into Tor 0.2.1.31. Fixes part of 12169.
Diffstat (limited to 'src/or')
-rw-r--r--src/or/relay.c10
1 files changed, 5 insertions, 5 deletions
diff --git a/src/or/relay.c b/src/or/relay.c
index 5c430a6d7..509d7ced0 100644
--- a/src/or/relay.c
+++ b/src/or/relay.c
@@ -111,14 +111,14 @@ relay_set_digest(crypto_digest_t *digest, cell_t *cell)
static int
relay_digest_matches(crypto_digest_t *digest, cell_t *cell)
{
- char received_integrity[4], calculated_integrity[4];
+ uint32_t received_integrity, calculated_integrity;
relay_header_t rh;
crypto_digest_t *backup_digest=NULL;
backup_digest = crypto_digest_dup(digest);
relay_header_unpack(&rh, cell->payload);
- memcpy(received_integrity, rh.integrity, 4);
+ memcpy(&received_integrity, rh.integrity, 4);
memset(rh.integrity, 0, 4);
relay_header_pack(cell->payload, &rh);
@@ -127,15 +127,15 @@ relay_digest_matches(crypto_digest_t *digest, cell_t *cell)
// received_integrity[2], received_integrity[3]);
crypto_digest_add_bytes(digest, (char*) cell->payload, CELL_PAYLOAD_SIZE);
- crypto_digest_get_digest(digest, calculated_integrity, 4);
+ crypto_digest_get_digest(digest, (char*) &calculated_integrity, 4);
- if (tor_memneq(received_integrity, calculated_integrity, 4)) {
+ if (calculated_integrity != received_integrity) {
// log_fn(LOG_INFO,"Recognized=0 but bad digest. Not recognizing.");
// (%d vs %d).", received_integrity, calculated_integrity);
/* restore digest to its old form */
crypto_digest_assign(digest, backup_digest);
/* restore the relay header */
- memcpy(rh.integrity, received_integrity, 4);
+ memcpy(rh.integrity, &received_integrity, 4);
relay_header_pack(cell->payload, &rh);
crypto_digest_free(backup_digest);
return 0;