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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
..
bpf
bpf: Fix a task_iter bug caused by a merge conflict resolution
2021-01-03 01:41:32 +01:00
cgroup
cgroup: fix psi monitor for root cgroup
2021-01-19 11:37:05 -05:00
configs
staging: ION: remove some references to CONFIG_ION
2021-01-06 17:39:38 +01:00
debug
smp: Cleanup smp_call_function*()
2020-11-24 16:47:49 +01:00
dma
Merge tag 'dma-mapping-5.11' of git://git.infradead.org/users/hch/dma-mapping
2020-12-22 13:19:43 -08:00
entry
Merge tag 'core-mm-2020-12-14' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2020-12-14 18:35:53 -08:00
events
Merge branch 'exec-update-lock-for-v5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
2020-12-15 19:36:48 -08:00
gcov
gcov: fix kernel-doc markup issue
2020-12-15 22:46:18 -08:00
irq
genirq: Fix export of irq_to_desc() for powerpc KVM
2020-12-25 11:02:39 -08:00
kcsan
kcsan: Fix encoding masks and regain address bit
2020-11-06 17:19:26 -08:00
livepatch
livepatch: Use the default ftrace_ops instead of REGS when ARGS is available
2020-11-13 12:15:28 -05:00
locking
Merge tag 'locking-core-2020-12-14' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2020-12-14 17:27:47 -08:00
power
Merge tag 'pm-5.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
2020-12-15 16:30:31 -08:00
printk
Merge tag 'printk-for-5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux
2020-12-16 10:45:11 -08:00
rcu
Merge branch 'rcu/urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu
2021-01-04 10:55:19 -08:00
sched
Merge tag 'sched-urgent-2020-12-27' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2020-12-27 09:00:47 -08:00
time
Merge tag 'timers-urgent-2020-12-27' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2020-12-27 09:03:41 -08:00
trace
tracing/kprobes: Do the notrace functions check without kprobes on ftrace
2021-01-11 16:09:53 -05:00
.gitignore
…
acct.c
kernel/acct.c: use #elif instead of #end and #elif
2020-12-15 22:46:15 -08:00
async.c
treewide: Remove uninitialized_var() usage
2020-07-16 12:35:15 -07:00
audit_fsnotify.c
fsnotify: generalize handle_inode_event()
2020-12-03 14:58:35 +01:00
audit_tree.c
fsnotify: generalize handle_inode_event()
2020-12-03 14:58:35 +01:00
audit_watch.c
fsnotify: generalize handle_inode_event()
2020-12-03 14:58:35 +01:00
audit.c
audit: replace atomic_add_return()
2020-12-02 22:52:16 -05:00
audit.h
audit: change unnecessary globals into statics
2020-08-17 20:26:58 -04:00
auditfilter.c
treewide: Use fallthrough pseudo-keyword
2020-08-23 17:36:59 -05:00
auditsc.c
Merge tag 'audit-pr-20201214' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/audit
2020-12-16 10:54:03 -08:00
backtracetest.c
treewide: Replace DECLARE_TASKLET() with DECLARE_TASKLET_OLD()
2020-07-30 11:15:58 -07:00
bounds.c
…
capability.c
LSM: Signal to SafeSetID when setting group IDs
2020-10-13 09:17:34 -07:00
compat.c
treewide: Use fallthrough pseudo-keyword
2020-08-23 17:36:59 -05:00
configs.c
…
context_tracking.c
…
cpu_pm.c
notifier: Fix broken error handling pattern
2020-09-01 09:58:03 +02:00
cpu.c
Merge tag 'sched-core-2020-12-14' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2020-12-14 18:29:11 -08:00
crash_core.c
kdump: append uts_namespace.name offset to VMCOREINFO
2020-12-15 22:46:18 -08:00
crash_dump.c
…
cred.c
…
delayacct.c
…
dma.c
…
exec_domain.c
…
exit.c
kernel/io_uring: cancel io_uring before task works
2020-12-30 19:36:54 -07:00
extable.c
…
fail_function.c
fault-injection: handle EI_ETYPE_TRUE
2020-12-15 22:46:19 -08:00
fork.c
kasan: rename (un)poison_shadow to (un)poison_range
2020-12-22 12:55:06 -08:00
freezer.c
…
futex.c
Merge branch 'locking/rwsem'
2020-12-09 17:08:45 +01:00
gen_kheaders.sh
…
groups.c
LSM: Signal to SafeSetID when setting group IDs
2020-10-13 09:17:34 -07:00
hung_task.c
kernel/hung_task.c: make type annotations consistent
2020-11-02 12:14:19 -08:00
iomem.c
…
irq_work.c
irq_work: Optimize irq_work_single()
2020-11-24 16:47:49 +01:00
jump_label.c
jump_label: Fix usage in module __init
2020-12-18 16:53:12 +01:00
kallsyms.c
treewide: Convert macro and uses of __section(foo) to __section("foo")
2020-10-25 14:51:49 -07:00
kcmp.c
Merge branch 'exec-update-lock-for-v5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
2020-12-15 19:36:48 -08:00
Kconfig.freezer
…
Kconfig.hz
…
Kconfig.locks
…
Kconfig.preempt
…
kcov.c
kernel: make kcov_common_handle consider the current context
2020-11-02 18:00:20 -08:00
kexec_core.c
crypto: sha - split sha.h into sha1.h and sha2.h
2020-11-20 14:45:33 +11:00
kexec_elf.c
…
kexec_file.c
crypto: sha - split sha.h into sha1.h and sha2.h
2020-11-20 14:45:33 +11:00
kexec_internal.h
…
kexec.c
LSM: Introduce kernel_post_load_data() hook
2020-10-05 13:37:03 +02:00
kheaders.c
…
kmod.c
kmod: remove redundant "be an" in the comment
2020-08-12 10:58:01 -07:00
kprobes.c
Merge branch 'linus' into perf/kprobes
2020-11-07 13:18:49 +01:00
ksysfs.c
…
kthread.c
Merge branch 'akpm' (patches from Andrew)
2020-12-15 12:53:37 -08:00
latencytop.c
…
Makefile
kcov: don't instrument with UBSAN
2020-12-15 22:46:19 -08:00
module_signature.c
…
module_signing.c
…
module-internal.h
…
module.c
Merge tag 'modules-for-v5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/jeyu/linux
2020-12-17 13:01:31 -08:00
notifier.c
notifier: Fix broken error handling pattern
2020-09-01 09:58:03 +02:00
nsproxy.c
Merge tag 'fixes-v5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/brauner/linux
2020-12-14 16:40:27 -08:00
padata.c
padata: fix possible padata_works_lock deadlock
2020-09-04 17:51:55 +10:00
panic.c
panic: don't dump stack twice on warn
2020-11-14 11:26:04 -08:00
params.c
Merge tag 'modules-for-v5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/jeyu/linux
2020-12-17 13:01:31 -08:00
pid_namespace.c
Merge tag 'fixes-v5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/brauner/linux
2020-12-14 16:40:27 -08:00
pid.c
Merge branch 'exec-update-lock-for-v5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
2020-12-15 19:36:48 -08:00
profile.c
…
ptrace.c
Merge branch 'akpm' (patches from Andrew)
2020-12-15 12:53:37 -08:00
range.c
kernel.h: split out min()/max() et al. helpers
2020-10-16 11:11:19 -07:00
reboot.c
reboot: hide from sysfs not applicable settings
2020-12-15 22:46:19 -08:00
regset.c
regset: kill ->get()
2020-07-27 14:31:12 -04:00
relay.c
relay: allow the use of const callback structs
2020-12-15 22:46:18 -08:00
resource_kunit.c
resource: provide meaningful MODULE_LICENSE() in test suite
2020-11-25 18:52:35 +01:00
resource.c
kernel/resource.c: fix kernel-doc markups
2020-12-15 22:46:18 -08:00
rseq.c
…
scftorture.c
scftorture: Add full-test stutter capability
2020-11-06 17:13:56 -08:00
scs.c
scs: switch to vmapped shadow stacks
2020-12-01 10:30:28 +00:00
seccomp.c
Merge tag 'seccomp-v5.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux
2020-12-16 11:30:10 -08:00
signal.c
Merge tag 'tif-task_work.arch-2020-12-14' of git://git.kernel.dk/linux-block
2020-12-16 12:33:35 -08:00
smp.c
Merge branch 'linus' into sched/core, to resolve semantic conflict
2020-11-27 11:10:50 +01:00
smpboot.c
…
smpboot.h
…
softirq.c
Merge tag 'locking-urgent-2020-12-27' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2020-12-27 09:06:10 -08:00
stackleak.c
stackleak: let stack_erasing_sysctl take a kernel pointer buffer
2020-09-19 13:13:39 -07:00
stacktrace.c
stacktrace: Remove reliable argument from arch_stack_walk() callback
2020-09-18 14:24:16 +01:00
static_call.c
static_call: Fix return type of static_call_init
2020-10-02 21:18:25 +02:00
stop_machine.c
Merge branch 'linus' into sched/core, to resolve semantic conflict
2020-11-27 11:10:50 +01:00
sys_ni.c
epoll: wire up syscall epoll_pwait2
2020-12-19 11:18:38 -08:00
sys.c
kernel: Implement selective syscall userspace redirection
2020-12-02 15:07:56 +01:00
sysctl-test.c
…
sysctl.c
rcu: Panic after fixed number of stalls
2020-11-19 19:37:16 -08:00
task_work.c
task_work: remove legacy TWA_SIGNAL path
2020-12-12 09:17:38 -07:00
taskstats.c
treewide: rename nla_strlcpy to nla_strscpy.
2020-11-16 08:08:54 -08:00
test_kprobes.c
…
torture.c
rcutorture: Make stutter_wait() caller restore priority
2020-11-06 17:13:54 -08:00
tracepoint.c
tracepoints: Migrate to use SYSCALL_WORK flag
2020-11-16 21:53:15 +01:00
tsacct.c
…
ucount.c
…
uid16.c
…
uid16.h
…
umh.c
usermodehelper: reset umask to default before executing user process
2020-10-06 10:31:52 -07:00
up.c
…
user_namespace.c
Merge tag 'fixes-v5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/brauner/linux
2020-12-14 16:40:27 -08:00
user-return-notifier.c
…
user.c
user: Use generic ns_common::count
2020-08-19 14:14:12 +02:00
usermode_driver.c
umd: Stop using split_argv
2020-07-07 11:58:59 -05:00
utsname_sysctl.c
…
utsname.c
uts: Use generic ns_common::count
2020-08-19 14:13:20 +02:00
watch_queue.c
watch_queue: Limit the number of watches a user can hold
2020-08-17 09:39:18 -07:00
watchdog_hld.c
…
watchdog.c
kernel/watchdog: fix watchdog_allowed_mask not used warning
2020-11-14 11:26:03 -08:00
workqueue_internal.h
…
workqueue.c
Merge branch 'for-5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq
2020-12-28 11:23:02 -08:00