On Thu, Apr 26, 2018 at 03:21:44PM +0800, Xin Long wrote:
> 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@xxxxxxxxxx>
> Signed-off-by: Xin Long <lucien.xin@xxxxxxxxx>
> ---
> net/sctp/stream.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/net/sctp/stream.c b/net/sctp/stream.c
> index f799043..f1f1d1b 100644
> --- a/net/sctp/stream.c
> +++ b/net/sctp/stream.c
> @@ -240,6 +240,8 @@ void sctp_stream_update(struct sctp_stream *stream, struct sctp_stream *new)
>
> new->out = NULL;
> new->in = NULL;
> + new->outcnt = 0;
> + new->incnt = 0;
> }
>
> static int sctp_send_reconf(struct sctp_association *asoc,
> --
> 2.1.0
>
>
Acked-by: Neil Horman <nhorman@xxxxxxxxxxxxx>
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