CVE-2021-47132

In the Linux kernel, the following vulnerability has been resolved:

mptcp: fix sk_forward_memory corruption on retransmission

MPTCP sk_forward_memory handling is a bit special, as such field

is protected by the msk socket spin_lock, instead of the plain

socket lock.

Currently we have a code path updating such field without handling

the relevant lock:

__mptcp_retrans() -> __mptcp_clean_una_wakeup()

Several helpers in __mptcp_clean_una_wakeup() will update

sk_forward_alloc, possibly causing such field corruption, as reported

by Matthieu.

Address the issue providing and using a new variant of blamed function

which explicitly acquires the msk spin lock.