Odin Ugedal 385aac1519 cgroup: fix psi monitor for root cgroup ... Fix NULL pointer dereference when adding new psi monitor to the root cgroup. PSI files for root cgroup was introduced in df5ba5be74 by using system wide psi struct when reading, but file write/monitor was not properly fixed. Since the PSI config for the root cgroup isn't initialized, the current implementation tries to lock a NULL ptr, resulting in a crash. Can be triggered by running this as root: $ tee /sys/fs/cgroup/cpu.pressure <<< "some 10000 1000000" Signed-off-by: Odin Ugedal <odin@uged.al> Reviewed-by: Suren Baghdasaryan <surenb@google.com> Acked-by: Dan Schatzberg <dschatzberg@fb.com> Fixes: df5ba5be74 ("kernel/sched/psi.c: expose pressure metrics on root cgroup") Acked-by: Johannes Weiner <hannes@cmpxchg.org> Cc: stable@vger.kernel.org # 5.2+ Signed-off-by: Tejun Heo <tj@kernel.org>		2021-01-19 11:37:05 -05:00
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Makefile	cgroup: cgroup v2 freezer	2019-04-19 11:26:48 -07:00
cgroup-internal.h	fs_parse: fold fs_parameter_desc/fs_parameter_spec	2020-02-07 14:48:37 -05:00
cgroup-v1.c	cgroup-v1: add disabled controller check in cgroup1_parse_param()	2021-01-15 15:10:37 -05:00
cgroup.c	cgroup: fix psi monitor for root cgroup	2021-01-19 11:37:05 -05:00
cpuset.c	cpuset: fix race between hotplug work and later CPU offline	2020-11-19 11:25:45 +01:00
debug.c	kernel: cgroup: fix misuse of %x	2019-05-06 08:47:48 -07:00
freezer.c	cgroup: freezer: don't change task and cgroups status unnecessarily	2019-11-07 07:38:41 -08:00
legacy_freezer.c	cgroup: rename freezer.c into legacy_freezer.c	2019-04-19 11:26:48 -07:00
namespace.c	cgroup: Use generic ns_common::count	2020-08-19 14:14:29 +02:00
pids.c	clone3: allow spawning processes into cgroups	2020-02-12 17:57:51 -05:00
rdma.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 451	2019-06-19 17:09:08 +02:00
rstat.c	cgroup: unexport cgroup_rstat_updated	2020-06-29 09:09:08 -06:00