On Thu, Apr 06, 2017 at 01:10:52PM +0800, Xin Long wrote:
> Now sctp doesn't check sock's state before listening on it. It could
> even cause changing a sock with any state to become a listening sock
> when doing sctp_listen.
>
> This patch is to fix it by checking sock's state in sctp_listen, so
> that it will listen on the sock with right state.
>
> Reported-by: Andrey Konovalov <andreyk...@google.com>
> Tested-by: Andrey Konovalov <andreyk...@google.com>
> Signed-off-by: Xin Long <lucien....@gmail.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leit...@gmail.com>
Dave, please consider this for -stable. Thanks
> ---
> net/sctp/socket.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/net/sctp/socket.c b/net/sctp/socket.c
> index c1401f4..d9d4c92 100644
> --- a/net/sctp/socket.c
> +++ b/net/sctp/socket.c
> @@ -7034,6 +7034,9 @@ int sctp_inet_listen(struct socket *sock, int backlog)
> if (sock->state != SS_UNCONNECTED)
> goto out;
>
> + if (!sctp_sstate(sk, LISTENING) && !sctp_sstate(sk, CLOSED))
> + goto out;
> +
> /* If backlog is zero, disable listening. */
> if (!backlog) {
> if (sctp_sstate(sk, CLOSED))
> --
> 2.1.0
>
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