From 0c6bce2819c688bb8d7fb3cff02c10d4e218d0fe Mon Sep 17 00:00:00 2001
From: Dane Springmeyer <dane@mapbox.com>
Date: Wed, 4 May 2016 10:12:15 -0700
Subject: [PATCH] [core] consistently protect against invalid tag encoding in
 vector tile

---
 src/mbgl/tile/vector_tile.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/mbgl/tile/vector_tile.cpp b/src/mbgl/tile/vector_tile.cpp
index aedb70389..25314c114 100644
--- a/src/mbgl/tile/vector_tile.cpp
+++ b/src/mbgl/tile/vector_tile.cpp
@@ -96,6 +96,9 @@ std::unordered_map<std::string,Value> VectorTileFeature::getProperties() const {
     const auto & end_itr = tags_iter.second;
     while (start_itr != end_itr) {
         uint32_t tag_key = static_cast<uint32_t>(*start_itr++);
+        if (start_itr == end_itr) {
+            throw std::runtime_error("uneven number of feature tag ids");
+        }
         uint32_t tag_val = static_cast<uint32_t>(*start_itr++);
         properties[layer.keys.at(tag_key)] = layer.values.at(tag_val);
     }