netdev - Re: [Patch net v2] tipc: fix a null pointer deref on error path

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Date:   Mon, 4 Dec 2017 11:41:15 -0800
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     David Miller <davem@...emloft.net>
Cc:     Linux Kernel Network Developers <netdev@...r.kernel.org>,
        tipc-discussion@...ts.sourceforge.net,
        Jon Maloy <jon.maloy@...csson.com>,
        Ying Xue <ying.xue@...driver.com>
Subject: Re: [Patch net v2] tipc: fix a null pointer deref on error path

On Mon, Dec 4, 2017 at 11:23 AM, Cong Wang <xiyou.wangcong@...il.com> wrote:
> On Mon, Dec 4, 2017 at 10:57 AM, David Miller <davem@...emloft.net> wrote:
>>
>> It looks like tipc_accept_from_sock() has a similar problem?  The
>> tipc_close_conn() will get invoked indirectly from the sock_release()
>> path right?
>
> Not sure, the sock_release() in tipc_accept_from_sock() is for
> kernel_accept(), not for tipc_alloc_conn(). Or maybe it is hiding
> deep in the call chain that I miss?

I see:

tipc_release() ->  tipc_sk_leave() -> tipc_group_delete()
-> tipc_topsrv_kern_unsubscr() -> tipc_close_conn()

Seems on this path we do need to skip NULL too.