From: Xin Long <lucien.xin@gmail.com> To: network dev <netdev@vger.kernel.org>, linux-sctp@vger.kernel.org Cc: davem@davemloft.net, Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>, Neil Horman <nhorman@tuxdriver.com> Subject: [PATCH net] sctp: remove sched init from sctp_stream_init Date: Fri, 8 Mar 2019 15:49:16 +0800 [thread overview] Message-ID: <f6f7a239cbe5a5dc051f605752e03b54d68e878a.1552031356.git.lucien.xin@gmail.com> (raw) 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@syzkaller.appspotmail.com Signed-off-by: Xin Long <lucien.xin@gmail.com> --- 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
WARNING: multiple messages have this Message-ID (diff)
From: Xin Long <lucien.xin@gmail.com> To: network dev <netdev@vger.kernel.org>, linux-sctp@vger.kernel.org Cc: davem@davemloft.net, Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>, Neil Horman <nhorman@tuxdriver.com> Subject: [PATCH net] sctp: remove sched init from sctp_stream_init Date: Fri, 08 Mar 2019 07:49:16 +0000 [thread overview] Message-ID: <f6f7a239cbe5a5dc051f605752e03b54d68e878a.1552031356.git.lucien.xin@gmail.com> (raw) 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@syzkaller.appspotmail.com Signed-off-by: Xin Long <lucien.xin@gmail.com> --- 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
next reply other threads:[~2019-03-08 7:49 UTC|newest] Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-03-08 7:49 Xin Long [this message] 2019-03-08 7:49 ` [PATCH net] sctp: remove sched init from sctp_stream_init Xin Long 2019-03-08 12:21 ` Neil Horman 2019-03-08 12:21 ` Neil Horman 2019-03-08 17:02 ` Marcelo Ricardo Leitner 2019-03-08 17:02 ` Marcelo Ricardo Leitner 2019-03-08 19:25 ` David Miller 2019-03-08 19:25 ` David Miller
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