netdev - Re: [PATCH v2 net] rds: Incorrect reference counting in TCP socket creation

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Message-ID: <20180302111813.GA853@oracle.com>
Date:   Fri, 2 Mar 2018 06:18:13 -0500
From:   Sowmini Varadhan <sowmini.varadhan@...cle.com>
To:     Ka-Cheong Poon <ka-cheong.poon@...cle.com>
Cc:     netdev@...r.kernel.org, santosh.shilimkar@...cle.com,
        davem@...emloft.net, rds-devel@....oracle.com
Subject: Re: [PATCH v2 net] rds: Incorrect reference counting in TCP socket
 creation

On (03/01/18 21:07), Ka-Cheong Poon wrote:
> Commit 0933a578cd55 ("rds: tcp: use sock_create_lite() to create the
> accept socket") has a reference counting issue in TCP socket creation
> when accepting a new connection.  The code uses sock_create_lite() to
> create a kernel socket.  But it does not do __module_get() on the
> socket owner.  When the connection is shutdown and sock_release() is
> called to free the socket, the owner's reference count is decremented
> and becomes incorrect.  Note that this bug only shows up when the socket
> owner is configured as a kernel module.

Acked-by: Sowmini Varadhan <sowmini.varadhan@...cle.com>