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Subject[PATCH v2 6/8] memcg: fail to create cgroup if the cgroup id is too big
memcg requires the cgroup id to be smaller than 65536.

Signed-off-by: Li Zefan <lizefan@huawei.com>
---
mm/memcontrol.c | 9 +++++++++
1 file changed, 9 insertions(+)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 35d8286..403c8d9 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -512,6 +512,12 @@ static inline bool mem_cgroup_is_root(struct mem_cgroup *memcg)
return (memcg == root_mem_cgroup);
}

+/*
+ * We restrict the id in the range of [1, 65535], so it can fit into
+ * an unsigned short.
+ */
+#define MEM_CGROUP_ID_MAX (65535)
+
static inline unsigned short mem_cgroup_id(struct mem_cgroup *memcg)
{
/*
@@ -6243,6 +6249,9 @@ mem_cgroup_css_alloc(struct cgroup *cont)
long error = -ENOMEM;
int node;

+ if (cont->id > MEM_CGROUP_ID_MAX)
+ return ERR_PTR(-ENOSPC);
+
memcg = mem_cgroup_alloc();
if (!memcg)
return ERR_PTR(error);
--
1.8.0.2

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