[tor-commits] [tor/maint-0.3.2] Clear the address when node_get_prim_orport() returns early

[nickm at torproject.org]

commit 5bca66be497f18b94a85ad8eb836fff5a356627d
Author: teor <teor2345 at gmail.com>
Date:   Sun Oct 15 16:45:15 2017 -0400

    Clear the address when node_get_prim_orport() returns early
    
    Fixes bug 23874; bugfix on 0.2.8.2-alpha.
---
 changes/bug23874  | 3 +++
 src/or/nodelist.c | 8 ++++++++
 2 files changed, 11 insertions(+)

diff --git a/changes/bug23874 b/changes/bug23874
new file mode 100644
index 000000000..bf6620553
--- /dev/null
+++ b/changes/bug23874
@@ -0,0 +1,3 @@
+  o Minor bugfixes (memory safety):
+    - Clear the address when node_get_prim_orport() returns early.
+      Fixes bug 23874; bugfix on 0.2.8.2-alpha.
diff --git a/src/or/nodelist.c b/src/or/nodelist.c
index 070e2e9e0..0e9a65181 100644
--- a/src/or/nodelist.c
+++ b/src/or/nodelist.c
@@ -1031,6 +1031,14 @@ node_get_prim_orport(const node_t *node, tor_addr_port_t *ap_out)
   node_assert_ok(node);
   tor_assert(ap_out);
 
+  /* Clear the address, as a safety precaution if calling functions ignore the
+   * return value */
+  tor_addr_make_null(&ap_out->addr, AF_INET);
+  ap_out->port = 0;
+
+  /* Check ri first, because rewrite_node_address_for_bridge() updates
+   * node->ri with the configured bridge address. */
+
   RETURN_IPV4_AP(node->ri, or_port, ap_out);
   RETURN_IPV4_AP(node->rs, or_port, ap_out);
   /* Microdescriptors only have an IPv6 address */