Description: mptcp: really cope with fastopen race
References:
Notes:
 carnil> Introduced in 1e777f39b4d7 ("mptcp: add MSG_FASTOPEN sendmsg flag support")
 carnil> 4fd19a307016 ("mptcp: fix inconsistent state on fastopen race"). Vulnerable
 carnil> versions: 6.2-rc1 6.6.10 6.7-rc7.
Bugs:
upstream: released (6.8-rc5) [337cebbd850f94147cee05252778f8f78b8c337f]
6.7-upstream-stable: released (6.7.6) [e158fb9679d15a2317ec13b4f6301bd26265df2f]
6.6-upstream-stable: released (6.6.18) [4bfe217e075d04e63c092df9d40c608e598c2ef2]
6.1-upstream-stable: N/A "Vulnerable code not present"
5.10-upstream-stable: N/A "Vulnerable code not present"
4.19-upstream-stable: N/A "Vulnerable code not present"
sid: released (6.7.7-1)
6.1-bookworm-security: N/A "Vulnerable code not present"
5.10-bullseye-security: N/A "Vulnerable code not present"
4.19-buster-security: N/A "Vulnerable code not present"