The worst thing it can do? Allow your program to execute normally, as if there was no bad pointer. Because then you have to worry about all these problems everyone is mentioning, except you have no idea and no hints that there is a serious security threat.

The best thing it can do? Crash your program, hopefully during a nice debugging session. That way you know there is something wrong, and hopefully you care enough to do what it takes to properly fix it.

The worst thing it can do? Allow your program to execute normally, as if there was no bad pointer. Because then you have to worry about all these problems everyone is mentioning, except you have no idea and no hints that there is a serious security thread.

The best thing it can do? Crash your program, hopefully during a nice debugging session. That way you know there is something wrong, and hopefully you care enough to do what it takes to properly fix it.