rtpn might be NULL in very rare case. We have better to check it before dereferencing it. Since memcg can live with NULL rb_tree_per_node in soft_limit_tree, warn this case and continue. Signed-off-by: Miaohe Lin <linmiaohe@xxxxxxxxxx> --- mm/memcontrol.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 5b4592d1e0f2..70a32174e7c4 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -7109,6 +7109,8 @@ static int __init mem_cgroup_init(void) rtpn = kzalloc_node(sizeof(*rtpn), GFP_KERNEL, node_online(node) ? node : NUMA_NO_NODE); + if (WARN_ON_ONCE(!rtpn)) + continue; rtpn->rb_root = RB_ROOT; rtpn->rb_rightmost = NULL; spin_lock_init(&rtpn->lock); -- 2.23.0
