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Date:   Tue, 19 Jul 2022 17:00:14 +0000
To:     Zhengchao Shao <>
Subject: Re: [PATCH v4,bpf-next] bpf: Don't redirect packets with invalid pkt_len


This patch was applied to bpf/bpf-next.git (master)
by Alexei Starovoitov <>:

On Fri, 15 Jul 2022 19:55:59 +0800 you wrote:
> Syzbot found an issue [1]: fq_codel_drop() try to drop a flow whitout any
> skbs, that is, the flow->head is null.
> The root cause, as the [2] says, is because that bpf_prog_test_run_skb()
> run a bpf prog which redirects empty skbs.
> So we should determine whether the length of the packet modified by bpf
> prog or others like bpf_prog_test is valid before forwarding it directly.
> [...]

Here is the summary with links:
  - [v4,bpf-next] bpf: Don't redirect packets with invalid pkt_len

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