netdev - Re: [PATCH net] sctp: clear the new asoc's stream outcnt in sctp_stream

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Date:   Fri, 27 Apr 2018 13:35:51 -0400 (EDT)
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: clear the new asoc's stream outcnt in
 sctp_stream_update

From: Xin Long <lucien.xin@...il.com>
Date: Thu, 26 Apr 2018 15:21:44 +0800

> When processing a duplicate cookie-echo chunk, sctp moves the new
> temp asoc's stream out/in into the old asoc, and later frees this
> new temp asoc.
> 
> But now after this move, the new temp asoc's stream->outcnt is not
> cleared while stream->out is set to NULL, which would cause a same
> crash as the one fixed in Commit 79d0895140e9 ("sctp: fix error
> path in sctp_stream_init") when freeing this asoc later.
> 
> This fix is to clear this outcnt in sctp_stream_update.
> 
> Fixes: f952be79cebd ("sctp: introduce struct sctp_stream_out_ext")
> Reported-by: Jianwen Ji <jiji@...hat.com>
> Signed-off-by: Xin Long <lucien.xin@...il.com>

Applied and queued up for -stable.