cgroup user-after-free

[tj at kernel.org]

On Thu, Jan 12, 2023 at 09:48:55AM +0000, Lixiong Liu (刘利雄) wrote:
> Hi,
> 
> We meet cgroup use-after-free happened in T SW version with 
> 
> kernel-5.15.
>  
> Root cause: 
> cgroup_migrate_finish free cset’s cgroup,
> 
> but cgroup_sk_alloc use the freed cgroup,
> 
> then use-after-free happened.

Sounds similar to the problem fixed by 07fd5b6cdf3c ("cgroup: Use separate
src/dst nodes when preloading css_sets for migration"). Can you try it out?

Thanks.

-- 
tejun