{"record":{"id":"eb18652194a769f9","repo":"MuntashirAkon/AppManager","slug":"the-ibinder-provided-is-invalid","errorCode":null,"errorMessage":"The IBinder provided is invalid","messagePattern":"The IBinder provided is invalid","errorType":"validation","errorClass":null,"httpStatus":null,"severity":"error","filePath":"libcore/io/src/main/java/io/github/muntashirakon/io/NIOFactory.java","lineNumber":87,"sourceCode":"                        // without truncating. Forced to open rw RAF in all cases.\n                        FileChannel ch = new RandomAccessFile(file, \"rw\").getChannel();\n                        if (f.truncate) {\n                            ch.truncate(0);\n                        }\n                        return ch;\n                    } else {\n                        return new FileInputStream(file).getChannel();\n                    }\n                }\n            }\n        };\n    }\n\n    public static FileSystemManager createRemote(@NonNull IBinder b) throws RemoteException {\n        Objects.requireNonNull(b);\n        IFileSystemService fs = IFileSystemService.Stub.asInterface(b);\n        if (fs == null) {\n            throw new IllegalArgumentException(\"The IBinder provided is invalid\");\n        }\n\n        fs.register(new Binder());\n        return new FileSystemManager() {\n            @NonNull\n            @Override\n            public ExtendedFile getFile(@NonNull String pathname) {\n                return new RemoteFile(fs, pathname);\n            }\n\n            @NonNull\n            @Override\n            public ExtendedFile getFile(@Nullable String parent, @NonNull String child) {\n                return new RemoteFile(fs, parent, child);\n            }\n\n            @NonNull\n            @Override","sourceCodeStart":69,"sourceCodeEnd":105,"githubUrl":"https://github.com/MuntashirAkon/AppManager/blob/0152f468fc9463ee02dc2ca83f6fe4989a2c4ca5/libcore/io/src/main/java/io/github/muntashirakon/io/NIOFactory.java#L69-L105","documentation":"FileSystemManager.createRemote(IBinder) wraps a binder to a remote IFileSystemService. Stub.asInterface(b) returns null if the binder is null or not a valid local/remote binder handle; in that case the method throws IllegalArgumentException(\"The IBinder provided is invalid\"). This guards against using dead, bogus, or wrong-process binder objects.","triggerScenarios":"Passing a null IBinder (requireNonNull also triggers), a Binder that has died or was never bound, or an IBinder obtained from the wrong service/component so IFileSystemService.Stub.asInterface yields null.","commonSituations":"Binding to the remote file service failed or the service was killed before createRemote was called; caching a binder across service restarts; passing the wrong service's binder (type confusion between AIDL interfaces).","solutions":["Verify the bind to IFileSystemService succeeded (onServiceConnected) and pass that fresh binder","Catch IllegalArgumentException and rebind/retry obtaining the service binder","Confirm the binder actually implements IFileSystemService (correct AIDL interface and package)"],"exampleFix":"// before\nFileSystemManager fm = FileSystemManager.createRemote(staleBinder); // IllegalArgumentException\n// after\nif (binder == null || !binder.isBinderAlive() || !binder.pingBinder()) {\n    binder = bindFileServiceAndWait(); // rebind\n}\nFileSystemManager fm = FileSystemManager.createRemote(binder);","handlingStrategy":"validation","validationCode":"if (binder == null || !binder.pingBinder()) { throw new IllegalStateException(\"bind the IFileSystemService before createRemote\"); }","typeGuard":"boolean isValidServiceBinder(IBinder b) { return b != null && b.pingBinder() && IFileSystemService.Stub.asInterface(b) != null; }","tryCatchPattern":"try { fm = FileSystemManager.createRemote(binder); } catch (IllegalArgumentException e) { /* rebind service and retry */ }","preventionTips":["Call createRemote only from onServiceConnected with the freshly delivered binder","Never cache binders across service restarts; rebind on death (DeathRecipient)","Ensure the AIDL interface and package match IFileSystemService exactly"],"tags":["android","ipc","binder","illegal-argument","service-binding"],"backgroundTag":"invalid-argument-value","analyzedSha":"0152f468fc9463ee02dc2ca83f6fe4989a2c4ca5","analyzedAt":"2026-09-12T14:03:37.243Z","contentChangedAt":"2026-09-12T14:03:37.243Z","schemaVersion":2},"datasetVersion":"2026-09-14T16:17:12.679Z"}