copy

shell/platform/darwin/common/framework/Source/FlutterChannels.mm

@@ -69,7 +69,7 @@ - (instancetype)initWithName:(NSString*)name
                    taskQueue:(NSObject<FlutterTaskQueue>*)taskQueue {
   self = [super init];
   NSAssert(self, @"Super init cannot be nil");
-  _name = name;
+  _name = [name copy];
   _messenger = messenger;
   _codec = codec;
   _taskQueue = taskQueue;
@@ -161,7 +161,7 @@ - (instancetype)initWithMethodName:(NSString*)method arguments:(id)arguments {
   NSAssert(method, @"Method name cannot be nil");
   self = [super init];
   NSAssert(self, @"Super init cannot be nil");
-  _method = method;
+  _method = [method copy];
   _arguments = arguments;
   return self;
 }
@@ -218,7 +218,7 @@ - (instancetype)initWithName:(NSString*)name
                    taskQueue:(NSObject<FlutterTaskQueue>*)taskQueue {
   self = [super init];
   NSAssert(self, @"Super init cannot be nil");
-  _name = name;
+  _name = [name copy];
   _messenger = messenger;
   _codec = codec;
   _taskQueue = taskQueue;
@@ -313,7 +313,7 @@ - (instancetype)initWithName:(NSString*)name
                    taskQueue:(NSObject<FlutterTaskQueue>* _Nullable)taskQueue {
   self = [super init];
   NSAssert(self, @"Super init cannot be nil");
-  _name = name;
+  _name = [name copy];
   _messenger = messenger;
   _codec = codec;
   _taskQueue = taskQueue;

shell/platform/darwin/common/framework/Source/FlutterStandardCodec.mm

@@ -170,7 +170,7 @@ - (instancetype)initWithData:(NSData*)data type:(FlutterStandardDataType)type {
   NSAssert(data.length % elementSize == 0, @"Data must contain integral number of elements");
   self = [super init];
   NSAssert(self, @"Super init cannot be nil");
-  _data = data;
+  _data = [data copy];
   _type = type;
   _elementSize = elementSize;
   _elementCount = data.length / elementSize;
@@ -326,7 +326,7 @@ @implementation FlutterStandardReader {
 - (instancetype)initWithData:(NSData*)data {
   self = [super init];
   NSAssert(self, @"Super init cannot be nil");
-  _data = data;
+  _data = [data copy];
   _range = NSMakeRange(0, 0);
   return self;
 }