Use pointer instead of reference parameter

src/core/tsi/alts/zero_copy_frame_protector/alts_zero_copy_grpc_protector.cc

@@ -234,11 +234,11 @@ static void alts_zero_copy_grpc_protector_destroy(
 }
 
 static tsi_result alts_zero_copy_grpc_protector_max_frame_size(
-    tsi_zero_copy_grpc_protector* self, size_t& max_frame_size) {
+    tsi_zero_copy_grpc_protector* self, size_t* max_frame_size) {
   if (self == nullptr) return TSI_INVALID_ARGUMENT;
   alts_zero_copy_grpc_protector* protector =
       reinterpret_cast<alts_zero_copy_grpc_protector*>(self);
-  max_frame_size = protector->max_protected_frame_size;
+  *max_frame_size = protector->max_protected_frame_size;
   return TSI_OK;
 }
 

src/core/tsi/transport_security_grpc.cc

@@ -66,7 +66,7 @@ void tsi_zero_copy_grpc_protector_destroy(tsi_zero_copy_grpc_protector* self) {
 }
 
 tsi_result tsi_zero_copy_grpc_protector_max_frame_size(
-    tsi_zero_copy_grpc_protector* self, size_t& max_frame_size) {
+    tsi_zero_copy_grpc_protector* self, size_t* max_frame_size) {
   if (self == nullptr) return TSI_INVALID_ARGUMENT;
   if (self->vtable->max_frame_size == nullptr) return TSI_UNIMPLEMENTED;
   return self->vtable->max_frame_size(self, max_frame_size);

src/core/tsi/transport_security_grpc.h

@@ -58,7 +58,7 @@ void tsi_zero_copy_grpc_protector_destroy(tsi_zero_copy_grpc_protector* self);
 
 /* Returns value of max protected frame size. Useful for testing. */
 tsi_result tsi_zero_copy_grpc_protector_max_frame_size(
-    tsi_zero_copy_grpc_protector* self, size_t& max_frame_size);
+    tsi_zero_copy_grpc_protector* self, size_t* max_frame_size);
 
 /* Base for tsi_zero_copy_grpc_protector implementations.  */
 typedef struct {
@@ -70,7 +70,7 @@ typedef struct {
                           grpc_slice_buffer* unprotected_slices);
   void (*destroy)(tsi_zero_copy_grpc_protector* self);
   tsi_result (*max_frame_size)(tsi_zero_copy_grpc_protector* self,
-                               size_t& max_frame_size);
+                               size_t* max_frame_size);
 } tsi_zero_copy_grpc_protector_vtable;
 
 struct tsi_zero_copy_grpc_protector {

test/core/tsi/alts/zero_copy_frame_protector/alts_zero_copy_grpc_protector_test.cc

@@ -116,14 +116,14 @@ alts_zero_copy_grpc_protector_test_fixture_create(bool rekey,
                  enable_extra_copy, &max_protected_frame_size,
                  &fixture->client) == TSI_OK);
   GPR_ASSERT(tsi_zero_copy_grpc_protector_max_frame_size(
-                 fixture->client, actual_max_protected_frame_size) == TSI_OK);
+                 fixture->client, &actual_max_protected_frame_size) == TSI_OK);
   GPR_ASSERT(actual_max_protected_frame_size == max_protected_frame_size);
   GPR_ASSERT(alts_zero_copy_grpc_protector_create(
                  key, key_length, rekey, /*is_client=*/false, integrity_only,
                  enable_extra_copy, &max_protected_frame_size,
                  &fixture->server) == TSI_OK);
   GPR_ASSERT(tsi_zero_copy_grpc_protector_max_frame_size(
-                 fixture->server, actual_max_protected_frame_size) == TSI_OK);
+                 fixture->server, &actual_max_protected_frame_size) == TSI_OK);
   GPR_ASSERT(actual_max_protected_frame_size == max_protected_frame_size);
   gpr_free(key);
   grpc_core::ExecCtx::Get()->Flush();