Merge branch 'bug7889_023' into maint-0.2.3

2 files changed, 25 insertions, 0 deletions

diff --git a/src/or/command.c b/src/or/command.c
index d935b5b18..8321e261e 100644
--- a/src/or/command.c
+++ b/src/or/command.c
@@ -382,6 +382,14 @@ command_process_create_cell(cell_t *cell, or_connection_t *conn)
     return;
   }
 
+  if (cell->circ_id == 0) {
+    log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL,
+           "Received a create cell (type %d) from %s:%d with zero circID; "
+           " ignoring.", (int)cell->command, conn->_base.address,
+           conn->_base.port);
+    return;
+  }
+
   /* If the high bit of the circuit ID is not as expected, close the
    * circ. */
   id_is_high = cell->circ_id & (1<<15);
diff --git a/src/or/relay.c b/src/or/relay.c
index 5f7fcd8b7..a17c33331 100644
--- a/src/or/relay.c
+++ b/src/or/relay.c
@@ -1046,6 +1046,23 @@ connection_edge_process_relay_cell(cell_t *cell, circuit_t *circ,
     return - END_CIRC_REASON_TORPROTOCOL;
   }
 
+  if (rh.stream_id == 0) {
+    switch (rh.command) {
+      case RELAY_COMMAND_BEGIN:
+      case RELAY_COMMAND_CONNECTED:
+      case RELAY_COMMAND_DATA:
+      case RELAY_COMMAND_END:
+      case RELAY_COMMAND_RESOLVE:
+      case RELAY_COMMAND_RESOLVED:
+      case RELAY_COMMAND_BEGIN_DIR:
+        log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL, "Relay command %d with zero "
+               "stream_id. Dropping.", (int)rh.command);
+        return 0;
+      default:
+        ;
+    }
+  }
+
   /* either conn is NULL, in which case we've got a control cell, or else
    * conn points to the recognized stream. */