Commit 625637bf authored by Xin Long's avatar Xin Long Committed by David S. Miller
Browse files

sctp: reinit stream if stream outcnt has been change by sinit in sendmsg

After introducing sctp_stream structure, sctp uses stream->outcnt as the
out stream nums instead of c.sinit_num_ostreams.

However when users use sinit in cmsg, it only updates c.sinit_num_ostreams
in sctp_sendmsg. At that moment, stream->outcnt is still using previous
value. If it's value is not updated, the sinit_num_ostreams of sinit could
not really work.

This patch is to fix it by updating stream->outcnt and reiniting stream
if stream outcnt has been change by sinit in sendmsg.

Fixes: a8386317

 ("sctp: prepare asoc stream for stream reconf")
Signed-off-by: default avatarXin Long <>
Acked-by: default avatarNeil Horman <>
Acked-by: default avatarMarcelo Ricardo Leitner <>
Signed-off-by: default avatarDavid S. Miller <>
parent 3d166130
......@@ -1883,8 +1883,14 @@ static int sctp_sendmsg(struct sock *sk, struct msghdr *msg, size_t msg_len)
if (sinit) {
if (sinit->sinit_num_ostreams) {
asoc->c.sinit_num_ostreams =
__u16 outcnt = sinit->sinit_num_ostreams;
asoc->c.sinit_num_ostreams = outcnt;
/* outcnt has been changed, so re-init stream */
err = sctp_stream_init(&asoc->stream, outcnt, 0,
if (err)
goto out_free;
if (sinit->sinit_max_instreams) {
asoc->c.sinit_max_instreams =
Markdown is supported
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment