On Fri, Mar 08, 2019 at 07:21:36AM -0500, Neil Horman wrote:
> On Fri, Mar 08, 2019 at 03:49:16PM +0800, Xin Long wrote:
> > syzbot reported a NULL-ptr deref caused by that sched->init() in
> > sctp_stream_init() set stream->rr_next = NULL.
> >
> > kasan: GPF could be caused by NULL-ptr deref or user memory access
> > RIP: 0010:sctp_sched_rr_dequeue+0xd3/0x170 net/sctp/stream_sched_rr.c:141
> > Call Trace:
> > sctp_outq_dequeue_data net/sctp/outqueue.c:90 [inline]
> > sctp_outq_flush_data net/sctp/outqueue.c:1079 [inline]
> > sctp_outq_flush+0xba2/0x2790 net/sctp/outqueue.c:1205
> >
> > All sched info is saved in sout->ext now, in sctp_stream_init()
> > sctp_stream_alloc_out() will not change it, there's no need to
> > call sched->init() again, since sctp_outq_init() has already
> > done it.
through sctp_sched_set_sched(), yes. Thanks Xin.
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@xxxxxxxxx>
> >
> > Fixes: 5bbbbe32a431 ("sctp: introduce stream scheduler foundations")
> > Reported-by: syzbot+4c9934f20522c0efd657@xxxxxxxxxxxxxxxxxxxxxxxxx
> > Signed-off-by: Xin Long <lucien.xin@xxxxxxxxx>
> > ---
> > net/sctp/stream.c | 2 --
> > 1 file changed, 2 deletions(-)
> >
> > diff --git a/net/sctp/stream.c b/net/sctp/stream.c
> > index 2936ed1..3b47457 100644
> > --- a/net/sctp/stream.c
> > +++ b/net/sctp/stream.c
> > @@ -230,8 +230,6 @@ int sctp_stream_init(struct sctp_stream *stream, __u16 outcnt, __u16 incnt,
> > for (i = 0; i < stream->outcnt; i++)
> > SCTP_SO(stream, i)->state = SCTP_STREAM_OPEN;
> >
> > - sched->init(stream);
> > -
> > in:
> > sctp_stream_interleave_init(stream);
> > if (!incnt)
> > --
> > 2.1.0
> >
> >
> Acked-by: Neil Horman <nhorman@xxxxxxxxxxxxx>
>
