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SubjectRe: [PATCH] cgroup1: fix leaked context root causing sporadic NULL deref in LTP
Hello,

On Wed, Jun 16, 2021 at 08:51:57AM -0400, Paul Gortmaker wrote:
> A fix would be to not leave the stale reference in fc->root as follows:
>
> --------------
>                 dput(fc->root);
> + fc->root = NULL;
>                 deactivate_locked_super(sb);
> --------------
>
> ...but then we are just open-coding a duplicate of fc_drop_locked() so we
> simply use that instead.

As this is unlikely to be a real-world problem both in probability and
circumstances, I'm applying this to cgroup/for-5.14 instead of
cgroup/for-5.13-fixes.

Thanks.

--
tejun

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