From e78ef29524ba8b7e197c8fe3cc8012096c87b928 Mon Sep 17 00:00:00 2001
From: "Benjamin A. Beasley" <code@musicinmybrain.net>
Date: Tue, 3 May 2022 12:59:51 -0400
Subject: [PATCH] Fix a segfault in client_lb_end2end_test

In the SubchannelStreamClient constructor, do not initialize an
absl::string_view with a null pointer; this leads to strlen() being
called on the null pointer. Let the absl::string_view be initialized
with the string literal "SubchannelStreamClient" in this case instead.

Fixes #29567.
---
 .../ext/filters/client_channel/subchannel_stream_client.cc     | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/core/ext/filters/client_channel/subchannel_stream_client.cc b/src/core/ext/filters/client_channel/subchannel_stream_client.cc
index a596e044568e..1079948bc3a4 100644
--- a/src/core/ext/filters/client_channel/subchannel_stream_client.cc
+++ b/src/core/ext/filters/client_channel/subchannel_stream_client.cc
@@ -50,7 +50,8 @@ SubchannelStreamClient::SubchannelStreamClient(
       call_allocator_(
           ResourceQuotaFromChannelArgs(connected_subchannel_->args())
               ->memory_quota()
-              ->CreateMemoryAllocator(tracer)),
+              ->CreateMemoryAllocator(
+                  (tracer != nullptr) ? tracer : "SubchannelStreamClient")),
       event_handler_(std::move(event_handler)),
       retry_backoff_(
           BackOff::Options()