# Re: \[PATCH\] video: fbdev: udlfb: Fix use after free on dlfb\_usb\_probe error path

- From: Bartlomiej Zolnierkiewicz \<hidden\>
- Date: 2017-08-21 14:36:00 
- List: linux-fbdev
- Page: https://ratatoskr.run/linux-fbdev/2017/08/5072170
- Thread: https://ratatoskr.run/linux-fbdev/2017/08/5065143/t.md

```text
On Friday, August 11, 2017 03:59:01 PM Anton Vasilyev wrote:
> If dlfb_usb_probe drops to error path then there is only one
> kref_init() call and no kref_get(), so second kref_put() leads to
> use after free.
> 
> The patch removes superfluous kref_put on dlfb_usb_probe error path.
> 
> Found by Linux Driver Verification project (linuxtesting.org).
> 
> Signed-off-by: Anton Vasilyev <redacted>

Patch queued for 4.14, thanks.

Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics

```