Description: mptcp: fix sk_forward_memory corruption on retransmission
References:
Notes:
 carnil> Introduced in 64b9cea7a0af ("mptcp: fix spurious retransmissions"). Vulnerable
 carnil> versions: 5.11.4 5.12-rc1.
Bugs:
upstream: released (5.13-rc5) [b5941f066b4ca331db225a976dae1d6ca8cf0ae3]
6.7-upstream-stable: N/A "Fixed before branching point"
6.6-upstream-stable: N/A "Fixed before branching point"
6.1-upstream-stable: N/A "Fixed before branching point"
5.10-upstream-stable: N/A "Vulnerable code not present"
4.19-upstream-stable: N/A "Vulnerable code not present"
sid: N/A "Vulnerable code not present"
6.1-bookworm-security: N/A "Fixed before branching point"
5.10-bullseye-security: N/A "Vulnerable code not present"
4.19-buster-security: N/A "Vulnerable code not present"