netdev - Re: [PATCH net] sctp: remove sched init from sctp_stream

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Date:   Fri, 08 Mar 2019 11:25:03 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     lucien.xin@...il.com
Cc:     netdev@...r.kernel.org, linux-sctp@...r.kernel.org,
        marcelo.leitner@...il.com, nhorman@...driver.com
Subject: Re: [PATCH net] sctp: remove sched init from sctp_stream_init

From: Xin Long <lucien.xin@...il.com>
Date: Fri,  8 Mar 2019 15:49:16 +0800

> 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.
> 
> Fixes: 5bbbbe32a431 ("sctp: introduce stream scheduler foundations")
> Reported-by: syzbot+4c9934f20522c0efd657@...kaller.appspotmail.com
> Signed-off-by: Xin Long <lucien.xin@...il.com>

Applied and queued up for -stable, thanks.