Re: [PATCH v4] flow_dissector: check device type before reading ETH_ADDRS

[patchwork-bot+netdevbpf]

Hello:

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

On Tue, 16 Jun 2026 20:30:57 +0800 you wrote:
> __skb_flow_dissect() unconditionally reads 12 bytes from eth_hdr(skb)
> when FLOW_DISSECTOR_KEY_ETH_ADDRS is requested. This assumes the skb
> has a valid Ethernet header at mac_header, which is not always the case.
> 
> The problem can be triggered by:
>  1. Creating a TUN device in L3 mode (IFF_TUN, hard_header_len=0)
>  2. Attaching a multiq qdisc with a flower filter matching on eth_src
>  3. Sending a packet through AF_PACKET
> 
> [...]

Here is the summary with links:
  - [v4] flow_dissector: check device type before reading ETH_ADDRS
    https://git.kernel.org/netdev/net/c/bf6e8af2c8be

You are awesome, thank you!
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