Description: mptcp: fix data re-injection from stale subflow
References:
Notes:
 carnil> Introduced in 1e1d9d6f119c ("mptcp: handle pending data on closed subflow").
 carnil> Vulnerable versions: 5.15-rc1.
Bugs:
upstream: released (6.8-rc3) [b6c620dc43ccb4e802894e54b651cf81495e9598]
6.8-upstream-stable: N/A "Fixed before branching point"
6.7-upstream-stable: released (6.7.6) [624902eab7abcb8731b333ec73f206d38d839cd8]
6.6-upstream-stable: released (6.6.18) [b609c783c535493aa3fca22c7e40a120370b1ca5]
6.1-upstream-stable: released (6.1.79) [6673d9f1c2cd984390550dbdf7d5ae07b20abbf8]
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: released (6.1.82-1)
5.10-bullseye-security: N/A "Vulnerable code not present"
4.19-buster-security: N/A "Vulnerable code not present"