netdev - Re: [PATCH net] sctp: initialize sin6_flowinfo for ipv6 addrs in sctp_inet6addr

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Message-Id: <20181210.115433.42616985092042285.davem@davemloft.net>
Date:   Mon, 10 Dec 2018 11:54:33 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     lucien.xin@...il.com
Cc:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        linux-sctp@...r.kernel.org, marcelo.leitner@...il.com,
        nhorman@...driver.com
Subject: Re: [PATCH net] sctp: initialize sin6_flowinfo for ipv6 addrs in
 sctp_inet6addr_event

From: Xin Long <lucien.xin@...il.com>
Date: Mon, 10 Dec 2018 18:00:52 +0800

> syzbot reported a kernel-infoleak, which is caused by an uninitialized
> field(sin6_flowinfo) of addr->a.v6 in sctp_inet6addr_event().
> The call trace is as below:
...
> sin6_flowinfo is not really used by SCTP, so it will be fixed by simply
> setting it to 0.
> 
> The issue exists since very beginning.
> Thanks Alexander for the reproducer provided.
> 
> Reported-by: syzbot+ad5d327e6936a2e284be@...kaller.appspotmail.com
> Signed-off-by: Xin Long <lucien.xin@...il.com>

Applied and queued up for -stable, thanks Xin.