From: Qi Zheng <zhengqi.arch@bytedance.com>
Reset pn->orig_objcg to NULL to prevent obj_cgroup_put()
from being called agagin in __mem_cgroup_free().
Reported-by: Usama Arif <usama.arif@linux.dev>
Signed-off-by: Qi Zheng <zhengqi.arch@bytedance.com>
---
mm/memcontrol.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 992a3f5caa62b..ad32639ea5959 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -4140,8 +4140,14 @@ static int mem_cgroup_css_online(struct cgroup_subsys_state *css)
for_each_node(nid) {
struct mem_cgroup_per_node *pn = memcg->nodeinfo[nid];
- if (pn && pn->orig_objcg)
+ if (pn && pn->orig_objcg) {
obj_cgroup_put(pn->orig_objcg);
+ /*
+ * Reset pn->orig_objcg to NULL to prevent obj_cgroup_put()
+ * from being called agagin in __mem_cgroup_free().
+ */
+ pn->orig_objcg = NULL;
+ }
}
free_shrinker_info(memcg);
offline_kmem:
--
2.20.1