Re: [PATCH 6/8] memcg, tcp_kmem: check for cg_proto in sock_update_memcg

[Vladimir Davydov]

On Wed, Jul 08, 2015 at 02:27:50PM +0200, Michal Hocko wrote:
> From: Michal Hocko <mhocko@xxxxxxx>
> 
> sk_prot->proto_cgroup is allowed to return NULL but sock_update_memcg
> doesn't check for NULL. The function relies on the mem_cgroup_is_root
> check because we shouldn't get NULL otherwise because
> mem_cgroup_from_task will always return !NULL.
> 
> All other callers are checking for NULL and we can safely replace
> mem_cgroup_is_root() check by cg_proto != NULL which will be more
> straightforward (proto_cgroup returns NULL for the root memcg already).
> 
> Signed-off-by: Michal Hocko <mhocko@xxxxxxx>

Reviewed-by: Vladimir Davydov <vdavydov@xxxxxxxxxxxxx>
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