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Subject[PATCH 4.14 32/33] cgroup: Fix css_task_iter_advance_css_set() cset skip condition
Date
From: Tejun Heo <tj@kernel.org>

commit c596687a008b579c503afb7a64fcacc7270fae9e upstream.

While adding handling for dying task group leaders c03cd7738a83
("cgroup: Include dying leaders with live threads in PROCS
iterations") added an inverted cset skip condition to
css_task_iter_advance_css_set(). It should skip cset if it's
completely empty but was incorrectly testing for the inverse condition
for the dying_tasks list. Fix it.

Signed-off-by: Tejun Heo <tj@kernel.org>
Fixes: c03cd7738a83 ("cgroup: Include dying leaders with live threads in PROCS iterations")
Reported-by: syzbot+d4bba5ccd4f9a2a68681@syzkaller.appspotmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
kernel/cgroup/cgroup.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/kernel/cgroup/cgroup.c
+++ b/kernel/cgroup/cgroup.c
@@ -4048,7 +4048,7 @@ static void css_task_iter_advance_css_se
it->task_pos = NULL;
return;
}
- } while (!css_set_populated(cset) && !list_empty(&cset->dying_tasks));
+ } while (!css_set_populated(cset) && list_empty(&cset->dying_tasks));

if (!list_empty(&cset->tasks))
it->task_pos = cset->tasks.next;

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