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From: patchwork-bot+netdevbpf@kernel.org
To: Sechang Lim <rhkrqnwk98@gmail.com>
Cc: davem@davemloft.net, edumazet@google.com, kuba@kernel.org,
	pabeni@redhat.com, jhs@mojatatu.com, jiri@resnulli.us,
	daniel@iogearbox.net, john.fastabend@gmail.com, sdf@fomichev.me,
	ast@kernel.org, andrii@kernel.org, martin.lau@linux.dev,
	horms@kernel.org, bpf@vger.kernel.org, netdev@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH net] net/sched: act_bpf: use rcu_dereference_bh() to read the filter
Date: Wed, 01 Jul 2026 02:20:06 +0000	[thread overview]
Message-ID: <178287240614.382687.14703752116363497366.git-patchwork-notify@kernel.org> (raw)
In-Reply-To: <20260629154112.1164986-1-rhkrqnwk98@gmail.com>

Hello:

This patch was applied to netdev/net.git (main)
by Jakub Kicinski <kuba@kernel.org>:

On Mon, 29 Jun 2026 15:41:06 +0000 you wrote:
> tcf_bpf_act() can run from the tc egress path, which holds only
> rcu_read_lock_bh(), but reads prog->filter with rcu_dereference() and
> trips lockdep:
> 
>   WARNING: suspicious RCU usage
>   net/sched/act_bpf.c:47 suspicious rcu_dereference_check() usage!
>   1 lock held by syz.2.1588/12756:
>    #0: (rcu_read_lock_bh){....}-{1:3}, at: __dev_queue_xmit net/core/dev.c:4792
>    tcf_bpf_act+0x6ae/0x940 net/sched/act_bpf.c:47
>    tcf_classify+0x6e4/0x1080 net/sched/cls_api.c:1860
>    sch_handle_egress net/core/dev.c:4545 [inline]
>    __dev_queue_xmit+0x2185/0x2c00 net/core/dev.c:4808
>    packet_sendmsg+0x3dfa/0x5120 net/packet/af_packet.c:3114
> 
> [...]

Here is the summary with links:
  - [net] net/sched: act_bpf: use rcu_dereference_bh() to read the filter
    https://git.kernel.org/netdev/net/c/adc49c7ba690

You are awesome, thank you!
-- 
Deet-doot-dot, I am a bot.
https://korg.docs.kernel.org/patchwork/pwbot.html



      parent reply	other threads:[~2026-07-01  2:20 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-06-29 15:41 [PATCH net] net/sched: act_bpf: use rcu_dereference_bh() to read the filter Sechang Lim
2026-06-29 16:38 ` Amery Hung
2026-07-01  2:20 ` patchwork-bot+netdevbpf [this message]

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