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| author | Xin Long <lucien.xin@gmail.com> | 2018-01-15 12:01:19 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-01-31 16:03:47 +0300 |
| commit | 3c6e5f2f5ef11bdba41e8158cc3c3e8ee6cfd198 (patch) | |
| tree | 10dc81149f545d036a78787469299ac5a39d6a2d /net/sctp/socket.c | |
| parent | 80f327285cab6ab8e10c3ea03278add5dd99fb02 (diff) | |
| download | linux-3c6e5f2f5ef11bdba41e8158cc3c3e8ee6cfd198.tar.xz | |
sctp: reinit stream if stream outcnt has been change by sinit in sendmsg
[ Upstream commit 625637bf4afa45204bd87e4218645182a919485a ]
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: a83863174a61 ("sctp: prepare asoc stream for stream reconf")
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net/sctp/socket.c')
| -rw-r--r-- | net/sctp/socket.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/net/sctp/socket.c b/net/sctp/socket.c index 7d432266645c..1c08d86efe94 100644 --- a/net/sctp/socket.c +++ b/net/sctp/socket.c @@ -1880,8 +1880,14 @@ 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 = - sinit->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, + GFP_KERNEL); + if (err) + goto out_free; } if (sinit->sinit_max_instreams) { asoc->c.sinit_max_instreams = |