netdev - Re: [PATCH net] sctp: not increase stream's incnt before sending addstrm

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Message-Id: <20181119.144709.2229023752451770304.davem@davemloft.net>
Date:   Mon, 19 Nov 2018 14:47:09 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     lucien.xin@...il.com
Cc:     netdev@...r.kernel.org, linux-sctp@...r.kernel.org,
        marcelo.leitner@...il.com, nhorman@...driver.com
Subject: Re: [PATCH net] sctp: not increase stream's incnt before sending
 addstrm_in request

From: Xin Long <lucien.xin@...il.com>
Date: Sun, 18 Nov 2018 21:59:49 +0800

> Different from processing the addstrm_out request, The receiver handles
> an addstrm_in request by sending back an addstrm_out request to the
> sender who will increase its stream's in and incnt later.
> 
> Now stream->incnt has been increased since it sent out the addstrm_in
> request in sctp_send_add_streams(), with the wrong stream->incnt will
> even cause crash when copying stream info from the old stream's in to
> the new one's in sctp_process_strreset_addstrm_out().
> 
> This patch is to fix it by simply removing the stream->incnt change
> from sctp_send_add_streams().
> 
> Fixes: 242bd2d519d7 ("sctp: implement sender-side procedures for Add Incoming/Outgoing Streams Request Parameter")
> Reported-by: Jianwen Ji <jiji@...hat.com>
> Signed-off-by: Xin Long <lucien.xin@...il.com>

Applied and queued up for -stable.