netdev - Re: [PATCHv2 net] net: sched: fix NULL pointer dereference when action calls some targets

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Message-Id: <20170818.162621.1683418805843691765.davem@davemloft.net>
Date:   Fri, 18 Aug 2017 16:26:21 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     lucien.xin@...il.com
Cc:     netdev@...r.kernel.org, xiyou.wangcong@...il.com,
        pablo@...filter.org
Subject: Re: [PATCHv2 net] net: sched: fix NULL pointer dereference when
 action calls some targets

From: Xin Long <lucien.xin@...il.com>
Date: Fri, 18 Aug 2017 11:01:36 +0800

> As we know in some target's checkentry it may dereference par.entryinfo
> to check entry stuff inside. But when sched action calls xt_check_target,
> par.entryinfo is set with NULL. It would cause kernel panic when calling
> some targets.
> 
> It can be reproduce with:
>   # tc qd add dev eth1 ingress handle ffff:
>   # tc filter add dev eth1 parent ffff: u32 match u32 0 0 action xt \
>     -j ECN --ecn-tcp-remove
> 
> It could also crash kernel when using target CLUSTERIP or TPROXY.
> 
> By now there's no proper value for par.entryinfo in ipt_init_target,
> but it can not be set with NULL. This patch is to void all these
> panics by setting it with an ipt_entry obj with all members = 0.
> 
> Note that this issue has been there since the very beginning.
> 
> Signed-off-by: Xin Long <lucien.xin@...il.com>

Applied and queued up for -stable, thanks.