Commit 721e9089 authored Jul 28, 2020 by Mat Martineau Committed by David S. Miller Jul 28, 2020

mptcp: Safely store sequence number when sending data



The MPTCP socket's write_seq member can be read without the msk lock
held, so use WRITE_ONCE() to store it.

Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent c7529392

net/mptcp/protocol.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -793,7 +793,7 @@ static int mptcp_sendmsg_frag(struct sock sk, struct sock ssk,
		out:
		if (!retransmission)
		pfrag->offset += frag_truesize;
		*write_seq += ret;
		WRITE_ONCE(write_seq, write_seq + ret);
		mptcp_subflow_ctx(ssk)->rel_write_seq += ret;

		return ret;

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