netdev - Re: [PATCH net] dccp: call inet_add_protocol after register_pernet_subsys in dccp_v4

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Date:   Tue, 20 Jun 2017 15:32:12 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     lucien.xin@...il.com
Cc:     netdev@...r.kernel.org, hannes@...essinduktion.org
Subject: Re: [PATCH net] dccp: call inet_add_protocol after
 register_pernet_subsys in dccp_v4_init

From: Xin Long <lucien.xin@...il.com>
Date: Tue, 20 Jun 2017 15:42:38 +0800

> Now dccp_ipv4 works as a kernel module. During loading this module, if
> one dccp packet is being recieved after inet_add_protocol but before
> register_pernet_subsys in which v4_ctl_sk is initialized, a null pointer
> dereference may be triggered because of init_net.dccp.v4_ctl_sk is 0x0.
> 
> Jianlin found this issue when the following call trace occurred:
 ...
> This patch is to move inet_add_protocol after register_pernet_subsys in
> dccp_v4_init, so that v4_ctl_sk is initialized before any incoming dccp
> packets are processed.
> 
> Reported-by: Jianlin Shi <jishi@...hat.com>
> Signed-off-by: Xin Long <lucien.xin@...il.com>

Applied.