Commit 721e9089 authored by Mat Martineau's avatar Mat Martineau Committed by David S. Miller
Browse files

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: default avatarMat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: default avatarDavid 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;