# Re: \[PATCH 06/15\] kernel: convert perf\_event\_context.refcount from atomic\_t to refcount\_t

- From: Peter Zijlstra \<peterz@infradead.org\>
- Date: 2017-07-07 09:28:09 
- List: cgroups
- Page: https://ratatoskr.run/cgroups/2017/07/124268
- Thread: https://ratatoskr.run/cgroups/2017/07/124139/t.md

```text
On Fri, Jul 07, 2017 at 12:04:20PM +0300, Elena Reshetova wrote:
> refcount_t type and corresponding API should be
> used instead of atomic_t when the variable is used as
> a reference counter. This allows to avoid accidental
> refcounter overflows that might lead to use-after-free
> situations.
> 
> Signed-off-by: Elena Reshetova <elena.reshetova@intel.com>
> Signed-off-by: Hans Liljestrand <redacted>
> Signed-off-by: Kees Cook <redacted>
> Signed-off-by: David Windsor <redacted>

That's an invalid SoB chain.. can't do anything with these patches.
```