From 93998ad5c1122c00cfa07115b10dd22cfae728db Mon Sep 17 00:00:00 2001 From: Igor Mammedov Date: Wed, 5 Oct 2011 11:43:50 +1100 Subject: [PATCH] memcg: do not expose uninitialized mem_cgroup_per_node to world If somebody is touching data too early, it might be easier to diagnose a problem when dereferencing NULL at mem->info.nodeinfo[node] than trying to understand why mem_cgroup_per_zone is [un|partly]initialized. Signed-off-by: Igor Mammedov Acked-by: Michal Hocko Cc: KAMEZAWA Hiroyuki Signed-off-by: Andrew Morton --- mm/memcontrol.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 613f723ab384..4a8a2488b595 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -4743,7 +4743,6 @@ static int alloc_mem_cgroup_per_zone_info(struct mem_cgroup *memcg, int node) if (!pn) return 1; - memcg->info.nodeinfo[node] = pn; for (zone = 0; zone < MAX_NR_ZONES; zone++) { mz = &pn->zoneinfo[zone]; for_each_lru(l) @@ -4752,6 +4751,7 @@ static int alloc_mem_cgroup_per_zone_info(struct mem_cgroup *memcg, int node) mz->on_tree = false; mz->mem = memcg; } + memcg->info.nodeinfo[node] = pn; return 0; } -- 2.39.5