* [MPTCP] [PATCH mptcp-next v4 11/12] mptcp: Safely read sequence number when lock isn't held
@ 2020-07-24 1:11 Mat Martineau
0 siblings, 0 replies; only message in thread
From: Mat Martineau @ 2020-07-24 1:11 UTC (permalink / raw)
To: mptcp
[-- Attachment #1: Type: text/plain, Size: 756 bytes --]
The MPTCP socket's write_seq member should be read with READ_ONCE() when
the msk lock is not held.
Signed-off-by: Mat Martineau <mathew.j.martineau(a)linux.intel.com>
---
net/mptcp/protocol.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index 2c5a9323cbe7..65aa2b9df721 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -1269,7 +1269,7 @@ static void mptcp_retransmit_handler(struct sock *sk)
{
struct mptcp_sock *msk = mptcp_sk(sk);
- if (atomic64_read(&msk->snd_una) == msk->write_seq) {
+ if (atomic64_read(&msk->snd_una) == READ_ONCE(msk->write_seq)) {
mptcp_stop_timer(sk);
} else {
set_bit(MPTCP_WORK_RTX, &msk->flags);
--
2.27.0
^ permalink raw reply related [flat|nested] only message in thread
only message in thread, other threads:[~2020-07-24 1:11 UTC | newest]
Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-07-24 1:11 [MPTCP] [PATCH mptcp-next v4 11/12] mptcp: Safely read sequence number when lock isn't held Mat Martineau
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.