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

- From: Sergey Senozhatsky \<hidden\>
- Date: 2019-05-15 06:21:18 
- List: linuxppc-dev
- Page: https://ratatoskr.run/linuxppc-dev/2019/05/5596922
- Thread: https://ratatoskr.run/linuxppc-dev/2019/05/5592853/t.md

```text
On (05/14/19 21:13), Geert Uytterhoeven wrote:
> I would immediately understand there's a missing IS_ERR() check in a
> function that can return  -EINVAL, without having to add a new printk()
> to find out what kind of bogus value has been received, and without
> having to reboot, and trying to reproduce...

But chances are that missing IS_ERR() will crash the kernel sooner
or later (in general case), if not in sprintf() then somewhere else.

	-ss
```