Merge pull request #14423 from ncteisen/fuzz-4147

Fix Fuzz 4147

src/core/ext/filters/client_channel/http_connect_handshaker.cc

@@ -254,7 +254,8 @@ static void http_connect_handshaker_do_handshake(
   // If not found, invoke on_handshake_done without doing anything.
   const grpc_arg* arg =
       grpc_channel_args_find(args->args, GRPC_ARG_HTTP_CONNECT_SERVER);
-  if (arg == nullptr) {
+  if (arg == nullptr || arg->type != GRPC_ARG_STRING) {
+    gpr_log(GPR_INFO, "HTTP CONNECT channel arg not found or invalid");
     // Set shutdown to true so that subsequent calls to
     // http_connect_handshaker_shutdown() do nothing.
     gpr_mu_lock(&handshaker->mu);

tools/run_tests/generated/tests.json

@@ -93261,6 +93261,29 @@
     ], 
     "uses_polling": false
   }, 
+  {
+    "args": [
+      "test/core/end2end/fuzzers/api_fuzzer_corpus/clusterfuzz-testcase-minimized-api_fuzzer-5632636438446080"
+    ], 
+    "ci_platforms": [
+      "linux"
+    ], 
+    "cpu_cost": 0.1, 
+    "exclude_configs": [
+      "tsan"
+    ], 
+    "exclude_iomgrs": [
+      "uv"
+    ], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "api_fuzzer_one_entry", 
+    "platforms": [
+      "mac", 
+      "linux"
+    ], 
+    "uses_polling": false
+  }, 
   {
     "args": [
       "test/core/end2end/fuzzers/api_fuzzer_corpus/crash-0597bbdd657fa4ed14443994c9147a1a7bbc205f"