From 820e0834aa658d53eface1d2f93b7538d95c065b Mon Sep 17 00:00:00 2001
From: Yuchen Zeng <zyc@google.com>
Date: Tue, 14 Mar 2017 01:16:09 -0700
Subject: [PATCH] Fix SetSocketMutator

---
 src/cpp/common/channel_arguments.cc | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/cpp/common/channel_arguments.cc b/src/cpp/common/channel_arguments.cc
index 65f32774999..33a10c0b8e1 100644
--- a/src/cpp/common/channel_arguments.cc
+++ b/src/cpp/common/channel_arguments.cc
@@ -101,8 +101,10 @@ void ChannelArguments::SetSocketMutator(grpc_socket_mutator* mutator) {
   for (auto it = args_.begin(); it != args_.end(); ++it) {
     if (it->type == mutator_arg.type &&
         grpc::string(it->key) == grpc::string(mutator_arg.key)) {
+      GPR_ASSERT(!replaced);
       it->value.pointer.vtable->destroy(&exec_ctx, it->value.pointer.p);
       it->value.pointer = mutator_arg.value.pointer;
+      replaced = true;
     }
   }
   grpc_exec_ctx_finish(&exec_ctx);