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Date:   Wed, 21 Dec 2022 00:20:15 +0000
To:     Jakub Kicinski <>
Subject: Re: [PATCH bpf 1/2] bpf: pull before calling skb_postpull_rcsum()


This series was applied to bpf/bpf.git (master)
by Martin KaFai Lau <>:

On Mon, 19 Dec 2022 16:47:00 -0800 you wrote:
> Anand hit a BUG() when pulling off headers on egress to a SW tunnel.
> We get to skb_checksum_help() with an invalid checksum offset
> (commit d7ea0d9df2a6 ("net: remove two BUG() from skb_checksum_help()")
> converted those BUGs to WARN_ONs()).
> He points out oddness in how skb_postpull_rcsum() gets used.
> Indeed looks like we should pull before "postpull", otherwise
> the CHECKSUM_PARTIAL fixup from skb_postpull_rcsum() will not
> be able to do its job:
> [...]

Here is the summary with links:
  - [bpf,1/2] bpf: pull before calling skb_postpull_rcsum()
  - [bpf,2/2] selftests/bpf: tunnel: add sanity test for checksums
    (no matching commit)

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