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mptcp: Safely store sequence number when sending data

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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>
This commit is contained in:
Mat Martineau 2020-07-28 15:12:10 -07:00 committed by David S. Miller
parent c75293925f
commit 721e908990
1 changed files with 1 additions and 1 deletions
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2
net/mptcp/protocol.c
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@ -793,7 +793,7 @@ static int mptcp_sendmsg_frag(struct sock *sk, struct sock *ssk,
out: out:
if (!retransmission) if (!retransmission)
pfrag->offset += frag_truesize; pfrag->offset += frag_truesize;
*write_seq += ret; WRITE_ONCE(*write_seq, *write_seq + ret);
mptcp_subflow_ctx(ssk)->rel_write_seq += ret; mptcp_subflow_ctx(ssk)->rel_write_seq += ret;
return ret; return ret;