Re: [PATCH net v3] mptcp: only set DATA_FIN when a mapping is present

Hello:

This patch was applied to netdev/net.git (main)
by Jakub Kicinski [off-list ref]:

On Thu,  9 Jul 2026 15:19:25 -0400 you wrote:

mptcp_get_options() clears only the status group of struct
mptcp_options_received; data_seq, subflow_seq and data_len are filled in
by mptcp_parse_option() exclusively inside the DSS mapping block, which
runs only when the DSS M (mapping present) bit is set.

A peer can send a DSS option with the DATA_FIN flag set but the mapping
bit clear. The parser then records mp_opt->data_fin while leaving
data_len and data_seq uninitialized. For a zero-length segment
mptcp_incoming_options() evaluates

[...]

Here is the summary with links:
  - [net,v3] mptcp: only set DATA_FIN when a mapping is present
    https://git.kernel.org/netdev/net/c/b2ff91b752b0

You are awesome, thank you!
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