On Thu, Nov 15, 2018 at 03:22:21PM -0200, Marcelo Ricardo Leitner wrote: > On Thu, Nov 15, 2018 at 07:14:28PM +0800, Xin Long wrote: > > As rfc7496#section4.5 says about SCTP_PR_SUPPORTED: > > > > This socket option allows the enabling or disabling of the > > negotiation of PR-SCTP support for future associations. For existing > > associations, it allows one to query whether or not PR-SCTP support > > was negotiated on a particular association. > > > > It means only sctp sock's prsctp_enable can be set. > > > > Note that for the limitation of SCTP_{CURRENT|ALL}_ASSOC, we will > > add it when introducing SCTP_{FUTURE|CURRENT|ALL}_ASSOC for linux > > sctp in another patchset. > > > > Fixes: 28aa4c26fce2 ("sctp: add SCTP_PR_SUPPORTED on sctp sockopt") > > Reported-by: Ying Xu <yinxu@xxxxxxxxxx> > > Signed-off-by: Xin Long <lucien.xin@xxxxxxxxx> > > --- > > net/sctp/socket.c | 13 +++---------- > > 1 file changed, 3 insertions(+), 10 deletions(-) > > > > diff --git a/net/sctp/socket.c b/net/sctp/socket.c > > index 739f3e5..e9b8232 100644 > > --- a/net/sctp/socket.c > > +++ b/net/sctp/socket.c > > @@ -3940,7 +3940,6 @@ static int sctp_setsockopt_pr_supported(struct sock *sk, > > unsigned int optlen) > > { > > struct sctp_assoc_value params; > > - struct sctp_association *asoc; > > int retval = -EINVAL; > > > > if (optlen != sizeof(params)) > > @@ -3951,16 +3950,10 @@ static int sctp_setsockopt_pr_supported(struct sock *sk, > > goto out; > > } > > > > - asoc = sctp_id2assoc(sk, params.assoc_id); > > - if (asoc) { > > - asoc->prsctp_enable = !!params.assoc_value; > > - } else if (!params.assoc_id) { > > - struct sctp_sock *sp = sctp_sk(sk); > > - > > - sp->ep->prsctp_enable = !!params.assoc_value; > > - } else { > > + if (sctp_style(sk, UDP) && sctp_id2assoc(sk, params.assoc_id)) > > This would allow using a non-existent assoc id on UDP-style sockets to > set it at the socket, which is not expected. It should be more like: > > + if (sctp_style(sk, UDP) && params.assoc_id) How do you see that to be the case? sctp_id2assoc will return NULL if an association isn't found, so the use of sctp_id2assoc should work just fine. Just checking params.assoc_id would instead fail the setting of any association id that isn't 0, which I don't think is what we want at all. Neil > > > goto out; > > - } > > + > > + sctp_sk(sk)->ep->prsctp_enable = !!params.assoc_value; > > > > retval = 0; > > > > -- > > 2.1.0 > > >