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

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Message-ID: <46079a126ad542d380add5f9ba6ffa85@AcuMS.aculab.com>
Date:   Tue, 18 Aug 2020 14:36:58 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     "'netdev@...r.kernel.org'" <netdev@...r.kernel.org>,
        "'linux-sctp@...r.kernel.org'" <linux-sctp@...r.kernel.org>
CC:     'Marcelo Ricardo Leitner' <marcelo.leitner@...il.com>
Subject: [PATCH] net: sctp: Fix negotiation of the number of data streams.

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.

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.

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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