# Re: \[PATCH\] drivers/video/fbdev/core/fbmem.c: add pointer judgment

- From: Matthew Wilcox \<willy@infradead.org\>
- Date: 2021-05-19 12:18:51 
- List: linux-fbdev
- Page: https://ratatoskr.run/linux-fbdev/2021/05/1383370
- Thread: https://ratatoskr.run/dri-devel/2021/05/1383361/t.md

```text
On Wed, May 19, 2021 at 08:00:28PM +0800, songqiang wrote:
> Signed-off-by: songqiang <redacted>
> ---

You need to explain:

 - Why you think this patch is needed
   - Did you observe a problem at runtime?
   - Is this the output from some checking tool?
 - Why this is the right way to address the problem

```