netdev - Re: [PATCH v3 net] dccp/tcp: fix ireq->opt races

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Message-Id: <20171020.070458.2242397039979446788.davem@davemloft.net>
Date:   Fri, 20 Oct 2017 07:04:58 +0100 (WEST)
From:   David Miller <davem@...emloft.net>
To:     eric.dumazet@...il.com
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH v3 net] dccp/tcp: fix ireq->opt races

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Thu, 19 Oct 2017 15:24:49 -0700

> From: Eric Dumazet <edumazet@...gle.com>
> 
> syzkaller found another bug in DCCP/TCP stacks [1]
> 
> For the reasons explained in commit ce1050089c96 ("tcp/dccp: fix
> ireq->pktopts race"), we need to make sure we do not access
> ireq->opt unless we own the request sock.
 ...
> Fixes: e994b2f0fb92 ("tcp: do not lock listener to process SYN packets")
> Fixes: 079096f103fa ("tcp/dccp: install syn_recv requests into ehash table")
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> ---
> v3: fixed the whit space mangling
> v2: removed some lines from KASAN report that confuse patchwork.

Much better, applied and queued up for -stable.