tor

commit 912ae2b8dc5d13344035def71c6e083a92752c09
parent 1570f17f97ad99ddf3f63745ab3571c1aa411141
Author: Nick Mathewson <nickm@torproject.org>
Date:   Fri,  7 Sep 2018 08:44:36 -0400

Merge remote-tracking branch 'teor/bug27463-029' into maint-0.2.9

Diffstat:
A
changes/bug27463
 | 
3
+++
M
src/or/rendclient.c
 | 
9
+++++++++

2 files changed, 12 insertions(+), 0 deletions(-)
diff --git a/changes/bug27463 b/changes/bug27463
@@ -0,0 +1,3 @@
+  o Minor bugfixes (onion services):
+    - Silence a spurious compiler warning in rend_client_send_introduction().
+      Fixes bug 27463; bugfix on 0.1.1.2-alpha.
diff --git a/src/or/rendclient.c b/src/or/rendclient.c
@@ -269,6 +269,15 @@ rend_client_send_introduction(origin_circuit_t *introcirc,
     dh_offset = v3_shift+7+DIGEST_LEN+2+klen+REND_COOKIE_LEN;
   } else {
     /* Version 0. */
+
+    /* Some compilers are smart enough to work out that nickname can be more
+     * than 19 characters, when it's a hexdigest. They warn that strncpy()
+     * will truncate hexdigests without NUL-terminating them. But we only put
+     * hexdigests in HSDir and general circuit exits. */
+    if (BUG(strlen(rendcirc->build_state->chosen_exit->nickname)
+            > MAX_NICKNAME_LEN)) {
+      goto perm_err;
+    }
     strncpy(tmp, rendcirc->build_state->chosen_exit->nickname,
             (MAX_NICKNAME_LEN+1)); /* nul pads */
     memcpy(tmp+MAX_NICKNAME_LEN+1, rendcirc->rend_data->rend_cookie,