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| author | Tejun Heo <tj@kernel.org> | 2017-01-26 16:47:28 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-02-09 08:08:28 +0100 |
| commit | 1d88791d5ed5dae4ff8cbbf6147e90ff95d92ba9 (patch) | |
| tree | 582aae843370930bd658dc5ac37b4a64125edaeb /drivers/mmc | |
| parent | a150e08704b24311a4d6215aade46691d6a7006a (diff) | |
| download | linux-rt-1d88791d5ed5dae4ff8cbbf6147e90ff95d92ba9.tar.gz | |
cgroup: don't online subsystems before cgroup_name/path() are operational
commit 07cd12945551b63ecb1a349d50a6d69d1d6feb4a upstream.
While refactoring cgroup creation, a5bca2152036 ("cgroup: factor out
cgroup_create() out of cgroup_mkdir()") incorrectly onlined subsystems
before the new cgroup is associated with it kernfs_node. This is fine
for cgroup proper but cgroup_name/path() depend on the associated
kernfs_node and if a subsystem makes the new cgroup_subsys_state
visible, which they're allowed to after onlining, it can lead to NULL
dereference.
The current code performs cgroup creation and subsystem onlining in
cgroup_create() and cgroup_mkdir() makes the cgroup and subsystems
visible afterwards. There's no reason to online the subsystems early
and we can simply drop cgroup_apply_control_enable() call from
cgroup_create() so that the subsystems are onlined and made visible at
the same time.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Fixes: a5bca2152036 ("cgroup: factor out cgroup_create() out of cgroup_mkdir()")
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/mmc')
0 files changed, 0 insertions, 0 deletions