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authorEric Dumazet <edumazet@google.com>2019-10-10 20:17:40 -0700
committerDavid S. Miller <davem@davemloft.net>2019-10-13 10:13:08 -0700
commit7db48e983930285b765743ebd665aecf9850582b (patch)
tree3ee9dad33e8d9a0d27cc576a5f3ebf077f5af2d0 /net/ipv4/tcp_minisocks.c
parentdba7d9b8c739df27ff3a234c81d6c6b23e3986fa (diff)
downloadlinux-7db48e983930285b765743ebd665aecf9850582b.tar.bz2
tcp: annotate tp->copied_seq lockless reads
There are few places where we fetch tp->copied_seq while this field can change from IRQ or other cpu. We need to add READ_ONCE() annotations, and also make sure write sides use corresponding WRITE_ONCE() to avoid store-tearing. Note that tcp_inq_hint() was already using READ_ONCE(tp->copied_seq) Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/tcp_minisocks.c')
-rw-r--r--net/ipv4/tcp_minisocks.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ipv4/tcp_minisocks.c b/net/ipv4/tcp_minisocks.c
index adc6ce486a38..c4731d26ab4a 100644
--- a/net/ipv4/tcp_minisocks.c
+++ b/net/ipv4/tcp_minisocks.c
@@ -478,7 +478,7 @@ struct sock *tcp_create_openreq_child(const struct sock *sk,
seq = treq->rcv_isn + 1;
newtp->rcv_wup = seq;
- newtp->copied_seq = seq;
+ WRITE_ONCE(newtp->copied_seq, seq);
WRITE_ONCE(newtp->rcv_nxt, seq);
newtp->segs_in = 1;