From: Eric Dumazet <edumazet@xxxxxxxxxx>
[ Upstream commit eb44ad4e635132754bfbcb18103f1dcb7058aedd ]
This field can be read or written without socket lock being held.
Add annotations to avoid load-store tearing.
Signed-off-by: Eric Dumazet <edumazet@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
include/net/sock.h | 6 +++---
net/core/sock.c | 2 +-
net/ipv4/tcp_output.c | 2 +-
3 files changed, 5 insertions(+), 5 deletions(-)
diff --git a/include/net/sock.h b/include/net/sock.h
index 8d98fcd9e89a9..b6027b01c2455 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -2207,7 +2207,7 @@ static inline void __dst_negative_advice(struct sock *sk)
if (ndst != dst) {
rcu_assign_pointer(sk->sk_dst_cache, ndst);
sk_tx_queue_clear(sk);
- sk->sk_dst_pending_confirm = 0;
+ WRITE_ONCE(sk->sk_dst_pending_confirm, 0);
}
}
}
@@ -2224,7 +2224,7 @@ __sk_dst_set(struct sock *sk, struct dst_entry *dst)
struct dst_entry *old_dst;
sk_tx_queue_clear(sk);
- sk->sk_dst_pending_confirm = 0;
+ WRITE_ONCE(sk->sk_dst_pending_confirm, 0);
old_dst = rcu_dereference_protected(sk->sk_dst_cache,
lockdep_sock_is_held(sk));
rcu_assign_pointer(sk->sk_dst_cache, dst);
@@ -2237,7 +2237,7 @@ sk_dst_set(struct sock *sk, struct dst_entry *dst)
struct dst_entry *old_dst;
sk_tx_queue_clear(sk);
- sk->sk_dst_pending_confirm = 0;
+ WRITE_ONCE(sk->sk_dst_pending_confirm, 0);
old_dst = xchg((__force struct dst_entry **)&sk->sk_dst_cache, dst);
dst_release(old_dst);
}
diff --git a/net/core/sock.c b/net/core/sock.c
index 0ee2e33bbe5f8..4305e55dbfba4 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -596,7 +596,7 @@ struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
INDIRECT_CALL_INET(dst->ops->check, ip6_dst_check, ipv4_dst_check,
dst, cookie) == NULL) {
sk_tx_queue_clear(sk);
- sk->sk_dst_pending_confirm = 0;
+ WRITE_ONCE(sk->sk_dst_pending_confirm, 0);
RCU_INIT_POINTER(sk->sk_dst_cache, NULL);
dst_release(dst);
return NULL;
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index cc7ed86fb0a57..5b93d1ed1ed19 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -1319,7 +1319,7 @@ static int __tcp_transmit_skb(struct sock *sk, struct sk_buff *skb,
skb->destructor = skb_is_tcp_pure_ack(skb) ? __sock_wfree : tcp_wfree;
refcount_add(skb->truesize, &sk->sk_wmem_alloc);
- skb_set_dst_pending_confirm(skb, sk->sk_dst_pending_confirm);
+ skb_set_dst_pending_confirm(skb, READ_ONCE(sk->sk_dst_pending_confirm));
/* Build TCP header and checksum it. */
th = (struct tcphdr *)skb->data;
--
2.42.0
