netdev - Re: [PATCH net] sctp: make sure stream nums can match optlen in sctp_setsockopt_reset

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Date:   Mon, 11 Dec 2017 14:09:05 -0500 (EST)
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,
        syzkaller@...glegroups.com
Subject: Re: [PATCH net] sctp: make sure stream nums can match optlen in
 sctp_setsockopt_reset_streams

From: Xin Long <lucien.xin@...il.com>
Date: Sun, 10 Dec 2017 15:40:51 +0800

> Now in sctp_setsockopt_reset_streams, it only does the check
> optlen < sizeof(*params) for optlen. But it's not enough, as
> params->srs_number_streams should also match optlen.
> 
> If the streams in params->srs_stream_list are less than stream
> nums in params->srs_number_streams, later when dereferencing
> the stream list, it could cause a slab-out-of-bounds crash, as
> reported by syzbot.
> 
> This patch is to fix it by also checking the stream numbers in
> sctp_setsockopt_reset_streams to make sure at least it's not
> greater than the streams in the list.
> 
> Fixes: 7f9d68ac944e ("sctp: implement sender-side procedures for SSN Reset Request Parameter")
> Reported-by: Dmitry Vyukov <dvyukov@...gle.com>
> Signed-off-by: Xin Long <lucien.xin@...il.com>

Applied and queued up for -stable, thanks.