From 2ba58f275cef6ae70c0d6f5a94f8bd3ff99f1e5e Mon Sep 17 00:00:00 2001
From: Nick Mathewson <nickm@torproject.org>
Date: Tue, 16 May 2017 11:20:12 -0400
Subject: [PATCH] Fix crash when starting with LearnCircuitBuildTimeout 0.

Before we've set our options, we can neither call get_options() nor
networkstatus_get_latest_consensus().

Fixes bug 22252; bugfix on 4d9d2553baa6856b1d85ec26baa1ac3d2c24832a
in 0.2.9.3-alpha.
---
 changes/bug22252      |  3 +++
 src/or/circuitstats.c | 12 ++++++++++--
 src/or/circuitstats.h |  3 +++
 src/or/config.c       |  2 +-
 4 files changed, 17 insertions(+), 3 deletions(-)
 create mode 100644 changes/bug22252

diff --git a/changes/bug22252 b/changes/bug22252
new file mode 100644
index 000000000..42b9d8e09
--- /dev/null
+++ b/changes/bug22252
@@ -0,0 +1,3 @@
+  o Minor bugfixes (configuration):
+    - Do not crash when starting with LearnCircuitBuildTimeout 0.
+      Fixes bug 22252; bugfix on 0.2.9.3-alpha.
diff --git a/src/or/circuitstats.c b/src/or/circuitstats.c
index 418acc002..d4487cfcb 100644
--- a/src/or/circuitstats.c
+++ b/src/or/circuitstats.c
@@ -106,12 +106,20 @@ get_circuit_build_timeout_ms(void)
  */
 int
 circuit_build_times_disabled(void)
+{
+  return circuit_build_times_disabled_(get_options());
+}
+
+/** As circuit_build_times_disabled, but take options as an argument. */
+int
+circuit_build_times_disabled_(const or_options_t *options,
+                              int ignore_consensus)
 {
   if (unit_tests) {
     return 0;
   } else {
-    const or_options_t *options = get_options();
-    int consensus_disabled = networkstatus_get_param(NULL, "cbtdisabled",
+    int consensus_disabled =
+      ignore_consensus ? 0 : networkstatus_get_param(NULL, "cbtdisabled",
                                                      0, 0, 1);
     int config_disabled = !options->LearnCircuitBuildTimeout;
     int dirauth_disabled = options->AuthoritativeDir;
diff --git a/src/or/circuitstats.h b/src/or/circuitstats.h
index 72b160983..38a994ded 100644
--- a/src/or/circuitstats.h
+++ b/src/or/circuitstats.h
@@ -18,6 +18,9 @@ double get_circuit_build_close_time_ms(void);
 double get_circuit_build_timeout_ms(void);
 
 int circuit_build_times_disabled(void);
+int circuit_build_times_disabled_(const or_options_t *options,
+                                  int ignore_consensus);
+
 int circuit_build_times_enough_to_compute(const circuit_build_times_t *cbt);
 void circuit_build_times_update_state(const circuit_build_times_t *cbt,
                                       or_state_t *state);
diff --git a/src/or/config.c b/src/or/config.c
index 3693cdf83..dd9f4eb19 100644
--- a/src/or/config.c
+++ b/src/or/config.c
@@ -3450,7 +3450,7 @@ options_validate(or_options_t *old_options, or_options_t *options,
     int severity = LOG_NOTICE;
     /* Be a little quieter if we've deliberately disabled
      * LearnCircuitBuildTimeout. */
-    if (circuit_build_times_disabled()) {
+    if (circuit_build_times_disabled_(options, 1)) {
       severity = LOG_INFO;
     }
     log_fn(severity, LD_CONFIG, "You disabled LearnCircuitBuildTimeout, but "