Merge branch 'mptcp-fixes'

Mat Martineau says:

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mptcp: Fixes for v5.12

These patches from the MPTCP tree fix a few multipath TCP issues:

Patches 1 and 5 clear some stale pointers when subflows close.

Patches 2, 4, and 9 plug some memory leaks.

Patch 3 fixes a memory accounting error identified by syzkaller.

Patches 6 and 7 fix a race condition that slowed data transmission.

Patch 8 adds missing wakeups when write buffer space is freed.
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Signed-off-by: David S. Miller <davem@davemloft.net>