Re: [PATCH] sched, cgroup: Use exit hook to avoid use-after-freecrash

[Miklos Vajna]

> Subject: sched, cgroup: Use exit hook to avoid use-after-free crash
> 
> By not notifying the controller of the on-exit move back to
> init_css_set, we fail to move the task out of the previous cgroup's
> cfs_rq. This leads to an opportunity for a cgroup-destroy to come in and
> free the cgroup (there are no active tasks left in it after all) to
> which the not-quite dead task is still enqueued.
> 
> Cc: stable@xxxxxxxxxx
> Reported-by: Miklos Vajna <vmiklos@xxxxxxxxxxxxxx>
> Signed-off-by: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
> ---
>  kernel/sched.c |   10 ++++++++++
>  1 files changed, 10 insertions(+), 0 deletions(-)

Thanks! :)

Reported-and-tested-by: Miklos Vajna <vmiklos@xxxxxxxxxxxxxx>

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