Re: [PATCH v10 3/7] i2c: fsi: Add port structures

[Benjamin Herrenschmidt]

On Wed, 2018-06-13 at 14:36 -0500, Eddie James wrote:
>  }
>  
> +static int fsi_i2c_remove(struct device *dev)
> +{
> +       struct fsi_i2c_master *i2c = dev_get_drvdata(dev);
> +       struct fsi_i2c_port *port;
> +
> +       list_for_each_entry(port, &i2c->ports, list) {
> +               i2c_del_adapter(&port->adapter);
> +               kfree(port);
> +       }
> +
> +       return 0;
> +}
> +

This is a use-after-free, the list linkage of the freed port is used to
get to the next one. With memory poisoning, kbooom !

You can fold that in: