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mptcp: reset rcv wnd on disconnect

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If the MPTCP socket fallback to TCP before the MP handshake completion,
the IASN remain 0, and the rcv_wnd_sent field is not explicitly
initialized, just incremented over time with the data transfer.

At disconnect time such value is not cleared. If the next connection falls
back to TCP before the MP handshake completion, the data transfer will
keep incrementing the receive window end sequence starting from the last
value used in the previous connection: the announced window will be
unrelated from the actual receiver buffer size and likely too big.

Address the issue zeroing the field at disconnect time.

Fixes: b29fcfb54c ("mptcp: full disconnect implementation")
Cc: stable@vger.kernel.org
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Link: https://patch.msgid.link/20260515-net-mptcp-misc-fixes-7-1-rc4-v2-4-701e96419f2f@kernel.org
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Paolo Abeni 2026-05-15 06:27:35 +02:00
parent fc5ef43318
commit 0981f90e1a
1 changed files with 1 additions and 0 deletions
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1
net/mptcp/protocol.c
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@ -3487,6 +3487,7 @@ static int mptcp_disconnect(struct sock *sk, int flags)
/* for fallback's sake */
WRITE_ONCE(msk->ack_seq, 0);
atomic64_set(&msk->rcv_wnd_sent, 0);
WRITE_ONCE(sk->sk_shutdown, 0);
sk_error_report(sk);