Re: [PATCH net] net/sched: act_bpf: use rcu_dereference_bh() to read the filter

[patchwork-bot+netdevbpf]

Hello:

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

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!
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