From a0e2881674cfb8f124440f96b08323e0a22c562e Mon Sep 17 00:00:00 2001
From: Craig Tiller <ctiller@google.com>
Date: Mon, 18 Oct 2021 09:27:21 -0700
Subject: [PATCH] Mark channel credentials channel arg as internal (#27752)

* Mark channel credentials channel arg as internal

* add reproducer
---
 src/core/lib/security/credentials/credentials.h |  2 +-
 .../api_fuzzer_corpus/testcase-5212802075197440 | 17 +++++++++++++++++
 2 files changed, 18 insertions(+), 1 deletion(-)
 create mode 100644 test/core/end2end/fuzzers/api_fuzzer_corpus/testcase-5212802075197440

diff --git a/src/core/lib/security/credentials/credentials.h b/src/core/lib/security/credentials/credentials.h
index 737fe87c7df..897ee8e2075 100644
--- a/src/core/lib/security/credentials/credentials.h
+++ b/src/core/lib/security/credentials/credentials.h
@@ -93,7 +93,7 @@ void grpc_override_well_known_credentials_path_getter(
 
 /* --- grpc_channel_credentials. --- */
 
-#define GRPC_ARG_CHANNEL_CREDENTIALS "grpc.channel_credentials"
+#define GRPC_ARG_CHANNEL_CREDENTIALS "grpc.internal.channel_credentials"
 
 // This type is forward declared as a C struct and we cannot define it as a
 // class. Otherwise, compiler will complain about type mismatch due to
diff --git a/test/core/end2end/fuzzers/api_fuzzer_corpus/testcase-5212802075197440 b/test/core/end2end/fuzzers/api_fuzzer_corpus/testcase-5212802075197440
new file mode 100644
index 00000000000..e79c06b0a63
--- /dev/null
+++ b/test/core/end2end/fuzzers/api_fuzzer_corpus/testcase-5212802075197440
@@ -0,0 +1,17 @@
+actions {
+  create_channel {
+    target: "unix::\360,\206::::::::::::\354\327::::::::::::::::::\213\300:::::174515:::::::::::::::::, \310/:::::::::::::::::::::::::::::::::::::::?:::::::::::::::::::::::::;::::::::::::::"
+    channel_args {
+      key: "grpc.channel_credentials"
+      resource_quota {
+      }
+    }
+    channel_creds {
+      ssl_channel_creds {
+      }
+    }
+  }
+}
+actions {
+  check_connectivity: true
+}