netdev - Re: [PATCH net] sctp: change sctp_prot .no

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Date:   Wed, 16 Oct 2019 13:26:12 +0800
From:   Xin Long <lucien.xin@...il.com>
To:     David Miller <davem@...emloft.net>
Cc:     network dev <netdev@...r.kernel.org>, linux-sctp@...r.kernel.org,
        Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
        Neil Horman <nhorman@...driver.com>
Subject: Re: [PATCH net] sctp: change sctp_prot .no_autobind with true

On Wed, Oct 16, 2019 at 11:39 AM David Miller <davem@...emloft.net> wrote:
>
> From: Xin Long <lucien.xin@...il.com>
> Date: Tue, 15 Oct 2019 15:24:38 +0800
>
> > syzbot reported a memory leak:
> >
> >   BUG: memory leak, unreferenced object 0xffff888120b3d380 (size 64):
> >   backtrace:
>  ...
> > It was caused by when sending msgs without binding a port, in the path:
> > inet_sendmsg() -> inet_send_prepare() -> inet_autobind() ->
> > .get_port/sctp_get_port(), sp->bind_hash will be set while bp->port is
> > not. Later when binding another port by sctp_setsockopt_bindx(), a new
> > bucket will be created as bp->port is not set.
> >
> > sctp's autobind is supposed to call sctp_autobind() where it does all
> > things including setting bp->port. Since sctp_autobind() is called in
> > sctp_sendmsg() if the sk is not yet bound, it should have skipped the
> > auto bind.
> >
> > THis patch is to avoid calling inet_autobind() in inet_send_prepare()
> > by changing sctp_prot .no_autobind with true, also remove the unused
> > .get_port.
> >
> > Reported-by: syzbot+d44f7bbebdea49dbc84a@...kaller.appspotmail.com
> > Signed-off-by: Xin Long <lucien.xin@...il.com>
>
> Applied and queued up for -stable.
>
> Xin, in the future please always provide a Fixes: even if it is the
> initial kernel repository commit.
Copy, thanks.