From 01eb164574bdcc938509810634dfb0348c484662 Mon Sep 17 00:00:00 2001
From: rl1987 <rl1987@sdf.lonestar.org>
Date: Fri, 31 Aug 2018 19:34:14 +0300
Subject: [PATCH] Reject addresses with needless trailing colon

---
 src/lib/net/address.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/lib/net/address.c b/src/lib/net/address.c
index 14c086a5b0..336693b464 100644
--- a/src/lib/net/address.c
+++ b/src/lib/net/address.c
@@ -1189,13 +1189,19 @@ tor_addr_parse(tor_addr_t *addr, const char *src)
   struct in6_addr in6_tmp;
   int brackets_detected = 0;
 
+  size_t len = strlen(src);
+
   tor_assert(addr && src);
-  if (src[0] == '[' && src[1] && src[strlen(src)-1] == ']') {
+  if (src[0] == '[' && src[1] && src[len - 1] == ']') {
     brackets_detected = 1;
     src = tmp = tor_strndup(src+1, strlen(src)-2);
+    len -= 2;
   }
 
-  if (tor_inet_pton(AF_INET6, src, &in6_tmp) > 0) {
+  /* Reject if src has needless trailing ':'. */
+  if (len > 2 && src[len - 1] == ':' && src[len - 2] != ':') {
+    result = -1;
+  } else if (tor_inet_pton(AF_INET6, src, &in6_tmp) > 0) {
     result = AF_INET6;
     tor_addr_from_in6(addr, &in6_tmp);
   } else if (!brackets_detected &&