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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

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!