# Re: \[PATCH 1/1\] rtc: pcf85063: fallback to parent of\_node

- From: Greg Kroah-Hartman \<gregkh@linuxfoundation.org\>
- Date: 2021-05-23 08:21:18 
- List: linux-rtc
- Page: https://ratatoskr.run/linux-rtc/2021/05/1388624
- Thread: https://ratatoskr.run/linux-rtc/2021/03/6295845/t.md

```text
On Sat, May 22, 2021 at 05:36:36PM +0200, Marc Kleine-Budde wrote:
> Hello Greg,
> 
> On 17.04.2021 00:16:40, Alexandre Belloni wrote:
> > On Wed, 10 Mar 2021 16:10:26 -0500, Francois Gervais wrote:
> > > The rtc device node is always or at the very least can possibly be NULL.
> > > 
> > > Since v5.12-rc1-dontuse/3c9ea42802a1fbf7ef29660ff8c6e526c58114f6 this
> > > will lead to a NULL pointer dereference.
> > > 
> > > To fix this we fallback to using the parent node which is the i2c client
> > > node as set by devm_rtc_allocate_device().
> > > 
> > > [...]
> > 
> > Applied, thanks!
> > 
> > [1/1] rtc: pcf85063: fallback to parent of_node
> >       commit: 03531606ef4cda25b629f500d1ffb6173b805c05
> > 
> > I made the fallback unconditionnal because this should have been that way from
> > the beginning as you point out.
> 
> can you queue this for stable, as it causes a NULL Pointer deref with
> (at least) v5.12.

After it hits Linus's tree, let stable@vger.kernel.org know the id and
we will glad to add it to the stable trees.

thanks,

greg k-h
```