# There is a bug
## Point Value150
## Challenge DescriptionBob is reckless when developing apps. He just created an app that can show the flag with the correct password. However, he just couldn't get the flag even with the right password, could you help him to fix the bug?
## DescriptionThere is a missing function call in the code. In particular, `result = getFlag(..);` should be called before showing the result in `TextView`. The player needs to decompile the app into `smali` code and manually add the function call. The function has several parameters which are all prepared inside the function. Players should order them in the correct way. Here is the `smali` code that need to be added:```smaliinvoke-virtual {p0, v0, v1, p0, v3}, Lcom/example/authenticator/MainActivity;->getFlag(Landroid/widget/TextView;Landroid/widget/EditText;Landroid/content/Context;Landroid/content/SharedPreferences;)Ljava/lang/String;move-result-object v5 # move the result to register v5 since v5 will be presented in `TextView` in the following code```Once added, the player needs to repackage and re-sign the app. Run it on the phone or emulator with the correct password, the flag will be presented.
There are other ways like using `frida` to directly call the `getFlag`. But the parameters need to be constructed properly.## Deploymentplayers just need access to Authenticator.apk