# Re: \[PATCH\] vsprintf: Do not break early boot with probing addresses

- From: Steven Rostedt \<rostedt@goodmis.org\>
- Date: 2019-05-10 16:24:07 
- List: linuxppc-dev
- Page: https://ratatoskr.run/linuxppc-dev/2019/05/5594189
- Thread: https://ratatoskr.run/linuxppc-dev/2019/05/5592853/t.md

```text
On Fri, 10 May 2019 10:42:13 +0200
Petr Mladek [ref] wrote:

>  static const char *check_pointer_msg(const void *ptr)
>  {
> -	char byte;
> -
>  	if (!ptr)
>  		return "(null)";
>  
> -	if (probe_kernel_address(ptr, byte))
> +	if ((unsigned long)ptr < PAGE_SIZE || IS_ERR_VALUE(ptr))
>  		return "(efault)";
>  


	< PAGE_SIZE ?

do you mean: < TASK_SIZE ?

-- Steve
```