netdev - Re: [PATCH 2/3] cgroup: duplicate cgroup reference when cloning sockets

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Message-ID: <20160919154321.GG1989@esperanza>
Date:   Mon, 19 Sep 2016 18:43:21 +0300
From:   Vladimir Davydov <vdavydov.dev@...il.com>
To:     Johannes Weiner <hannes@...xchg.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Tejun Heo <tj@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Michal Hocko <mhocko@...e.cz>, linux-mm@...ck.org,
        cgroups@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel-team@...com
Subject: Re: [PATCH 2/3] cgroup: duplicate cgroup reference when cloning
 sockets

On Wed, Sep 14, 2016 at 03:48:45PM -0400, Johannes Weiner wrote:
> From: Johannes Weiner <jweiner@...com>
> 
> When a socket is cloned, the associated sock_cgroup_data is duplicated
> but not its reference on the cgroup. As a result, the cgroup reference
> count will underflow when both sockets are destroyed later on.
> 
> Fixes: bd1060a1d671 ("sock, cgroup: add sock->sk_cgroup")
> Cc: <stable@...r.kernel.org> # 4.5+
> Signed-off-by: Johannes Weiner <hannes@...xchg.org>

Reviewed-by: Vladimir Davydov <vdavydov.dev@...il.com>