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Subject[PATCH] cgroup: fix potential null pointer risk
Date
We previously assumed 'parent' could be null,
so null pointer judgment should be added.

Signed-off-by: Shida Zhang <zhangshida@kylinos.cn>
---
kernel/cgroup/cgroup.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c
index adb820e98f24..7f230b0ab644 100644
--- a/kernel/cgroup/cgroup.c
+++ b/kernel/cgroup/cgroup.c
@@ -5701,7 +5701,8 @@ static int cgroup_destroy_locked(struct cgroup *cgrp)
}
spin_unlock_irq(&css_set_lock);

- cgroup1_check_for_release(parent);
+ if (parent)
+ cgroup1_check_for_release(parent);

cgroup_bpf_offline(cgrp);

--
2.25.1
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