From: Jiri Pirko <jiri@resnulli.us>
To: David Miller <davem@davemloft.net>
Cc: netdev@vger.kernel.org, jhs@mojatatu.com,
xiyou.wangcong@gmail.com, kubakici@wp.pl, mlxsw@mellanox.com
Subject: Re: [patch net] net: sched: fix use-after-free in tcf_action_destroy and tcf_del_walker
Date: Wed, 13 Sep 2017 22:50:06 +0200 [thread overview]
Message-ID: <20170913205006.GD1981@nanopsycho> (raw)
In-Reply-To: <20170913.093428.806129519464331602.davem@davemloft.net>
Wed, Sep 13, 2017 at 06:34:28PM CEST, davem@davemloft.net wrote:
>From: Jiri Pirko <jiri@resnulli.us>
>Date: Wed, 13 Sep 2017 17:32:37 +0200
>
>> From: Jiri Pirko <jiri@mellanox.com>
>>
>> Recent commit d7fb60b9cafb ("net_sched: get rid of tcfa_rcu") removed
>> freeing in call_rcu, which changed already existing hard-to-hit
>> race condition into 100% hit:
>>
>> [ 598.599825] BUG: unable to handle kernel NULL pointer dereference at 0000000000000030
>> [ 598.607782] IP: tcf_action_destroy+0xc0/0x140
>>
>> Or:
>>
>> [ 40.858924] BUG: unable to handle kernel NULL pointer dereference at 0000000000000030
>> [ 40.862840] IP: tcf_generic_walker+0x534/0x820
>>
>> Fix this by storing the ops and use them directly for module_put call.
>>
>> Fixes: a85a970af265 ("net_sched: move tc_action into tcf_common")
>> Signed-off-by: Jiri Pirko <jiri@mellanox.com>
>
>Applied, thanks Jiri.
Oh, I forgot to mention, this would be nice to push to stable.
next prev parent reply other threads:[~2017-09-13 20:50 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-13 15:32 [patch net] net: sched: fix use-after-free in tcf_action_destroy and tcf_del_walker Jiri Pirko
2017-09-13 16:34 ` David Miller
2017-09-13 20:50 ` Jiri Pirko [this message]
2017-09-13 20:59 ` David Miller
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