On 2013/11/28 7:15, Tejun Heo wrote:
> If a cgroup file implements either read_map() or read_seq_string(),
> such file is served using seq_file by overriding file->f_op to
> cgroup_seqfile_operations, which also overrides the release method to
> single_release() from cgroup_file_release().
>
> Because cgroup_file_open() didn't use to acquire any resources, this
> used to be fine, but since f7d58818ba42 ("cgroup: pin
> cgroup_subsys_state when opening a cgroupfs file"), cgroup_file_open()
> pins the css (cgroup_subsys_state) which is put by
> cgroup_file_release(). The patch forgot to update the release path
> for seq_files and each open/release cycle leaks a css reference.
>
> Fix it by updating cgroup_file_release() to also handle seq_files and
> using it for seq_file release path too.
>
> Signed-off-by: Tejun Heo <tj@xxxxxxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx # v3.12
> ---
> Hello,
>
> I'm applying this to for-3.13-fixes right away so that I can push it
> out to Linus tomorrow along with other fixes.
>
That's fine.
bwt, I'll finish reviewing the cgroup pidlist patchset tomorrow.
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