netdev - Re: [PATCH] net: sctp: Fix negotiation of the number of data streams.

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Date:   Tue, 18 Aug 2020 18:46:48 -0300
From:   'Marcelo Ricardo Leitner' <marcelo.leitner@...il.com>
To:     David Laight <David.Laight@...lab.com>
Cc:     "'netdev@...r.kernel.org'" <netdev@...r.kernel.org>,
        "'linux-sctp@...r.kernel.org'" <linux-sctp@...r.kernel.org>
Subject: Re: [PATCH] net: sctp: Fix negotiation of the number of data streams.

On Tue, Aug 18, 2020 at 02:36:58PM +0000, David Laight wrote:
> The number of streams offered by the remote system was being ignored.
> Any data sent on those streams would get discarded by the remote system.

That's quite brief and not accurate: it was only ignored if 'Xcnt <=
stream->Xcnt'.

Other than this and the Fixes tag, LGTM. Passes the tests here. I'll
ack the v2 then.

> 
> Fixes 2075e50caf5ea.
> 
> Signed-off-by: David Laight <david.laight@...lab.com>
> ---
>  net/sctp/stream.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> This needs backporting to 5.1 and all later kernels.

A 'net' tree tag in patch tags is welcomed.

> 
> diff --git a/net/sctp/stream.c b/net/sctp/stream.c
> index bda2536dd740..6dc95dcc0ff4 100644
> --- a/net/sctp/stream.c
> +++ b/net/sctp/stream.c
> @@ -88,12 +88,13 @@ static int sctp_stream_alloc_out(struct sctp_stream *stream, __u16 outcnt,
>  	int ret;
>  
>  	if (outcnt <= stream->outcnt)
> -		return 0;
> +		goto out;
>  
>  	ret = genradix_prealloc(&stream->out, outcnt, gfp);
>  	if (ret)
>  		return ret;
>  
> +out:
>  	stream->outcnt = outcnt;
>  	return 0;
>  }
> @@ -104,12 +105,13 @@ static int sctp_stream_alloc_in(struct sctp_stream *stream, __u16 incnt,
>  	int ret;
>  
>  	if (incnt <= stream->incnt)
> -		return 0;
> +		goto out;
>  
>  	ret = genradix_prealloc(&stream->in, incnt, gfp);
>  	if (ret)
>  		return ret;
>  
> +out:
>  	stream->incnt = incnt;
>  	return 0;
>  }
> -- 
> 2.25.1
> 
> -
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