SERVER-25075 Limit BSONObj buffer size used by 2dsphere index.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/mongo/db/index/expression_keys_private.cpp b/src/mongo/db/index/expression_keys_private.cpp
index 6644e5015e1..5276f25943e 100644
--- a/src/mongo/db/index/expression_keys_private.cpp
+++ b/src/mongo/db/index/expression_keys_private.cpp
@@ -146,12 +146,12 @@ void getS2GeoKeys(const BSONObj& document,
         for (vector<string>::const_iterator it = cells.begin(); it != cells.end(); ++it) {
             BSONObjBuilder b;
             b.append("", *it);
-            out->insert(b.obj());
+            out->insert(b.obj().copy());
         }
     }
 
     if (0 == out->size()) {
-        BSONObjBuilder b;
+        BSONObjBuilder b(7);
         b.appendNull("");
         out->insert(b.obj());
     }