netdev - Re: [PATCH net] dccp: check sk for closed state in dccp

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Message-Id: <20180307.133949.1744894683110217494.davem@davemloft.net>
Date:   Wed, 07 Mar 2018 13:39:49 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     alexey.kodanev@...cle.com
Cc:     netdev@...r.kernel.org, edumazet@...gle.com
Subject: Re: [PATCH net] dccp: check sk for closed state in dccp_sendmsg()

From: Alexey Kodanev <alexey.kodanev@...cle.com>
Date: Tue,  6 Mar 2018 22:57:01 +0300

> dccp_disconnect() sets 'dp->dccps_hc_tx_ccid' tx handler to NULL,
> therefore if DCCP socket is disconnected and dccp_sendmsg() is
> called after it, it will cause a NULL pointer dereference in
> dccp_write_xmit().
> 
> This crash and the reproducer was reported by syzbot. Looks like
> it is reproduced if commit 69c64866ce07 ("dccp: CVE-2017-8824:
> use-after-free in DCCP code") is applied.
> 
> Reported-by: syzbot+f99ab3887ab65d70f816@...kaller.appspotmail.com
> Signed-off-by: Alexey Kodanev <alexey.kodanev@...cle.com>

Applied and queued up for -stable, thanks!