netdev - [PATCH net-next 1/5] inet_diag: annotate data-races in inet_diag_msg_common

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Message-ID: <20250828102738.2065992-2-edumazet@google.com>
Date: Thu, 28 Aug 2025 10:27:34 +0000
From: Eric Dumazet <edumazet@...gle.com>
To: "David S . Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, 
	Paolo Abeni <pabeni@...hat.com>, Neal Cardwell <ncardwell@...gle.com>
Cc: Simon Horman <horms@...nel.org>, Kuniyuki Iwashima <kuniyu@...gle.com>, 
	Willem de Bruijn <willemb@...gle.com>, netdev@...r.kernel.org, eric.dumazet@...il.com, 
	Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH net-next 1/5] inet_diag: annotate data-races in inet_diag_msg_common_fill()

inet_diag_msg_common_fill() can run without socket lock.
Add READ_ONCE() or data_race() annotations.

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 net/ipv4/inet_diag.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/net/ipv4/inet_diag.c b/net/ipv4/inet_diag.c
index 9d4dcd17728cd17e693b59cee03f37b75f6c923a..7a9c347bc66fe35fa9771649db2f205af30e2a44 100644
--- a/net/ipv4/inet_diag.c
+++ b/net/ipv4/inet_diag.c
@@ -71,25 +71,25 @@ static void inet_diag_unlock_handler(const struct inet_diag_handler *handler)
 
 void inet_diag_msg_common_fill(struct inet_diag_msg *r, struct sock *sk)
 {
-	r->idiag_family = sk->sk_family;
+	r->idiag_family = READ_ONCE(sk->sk_family);
 
-	r->id.idiag_sport = htons(sk->sk_num);
-	r->id.idiag_dport = sk->sk_dport;
-	r->id.idiag_if = sk->sk_bound_dev_if;
+	r->id.idiag_sport = htons(READ_ONCE(sk->sk_num));
+	r->id.idiag_dport = READ_ONCE(sk->sk_dport);
+	r->id.idiag_if = READ_ONCE(sk->sk_bound_dev_if);
 	sock_diag_save_cookie(sk, r->id.idiag_cookie);
 
 #if IS_ENABLED(CONFIG_IPV6)
-	if (sk->sk_family == AF_INET6) {
-		*(struct in6_addr *)r->id.idiag_src = sk->sk_v6_rcv_saddr;
-		*(struct in6_addr *)r->id.idiag_dst = sk->sk_v6_daddr;
+	if (r->idiag_family == AF_INET6) {
+		data_race(*(struct in6_addr *)r->id.idiag_src = sk->sk_v6_rcv_saddr);
+		data_race(*(struct in6_addr *)r->id.idiag_dst = sk->sk_v6_daddr);
 	} else
 #endif
 	{
 	memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
 	memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
 
-	r->id.idiag_src[0] = sk->sk_rcv_saddr;
-	r->id.idiag_dst[0] = sk->sk_daddr;
+	r->id.idiag_src[0] = READ_ONCE(sk->sk_rcv_saddr);
+	r->id.idiag_dst[0] = READ_ONCE(sk->sk_daddr);
 	}
 }
 EXPORT_SYMBOL_GPL(inet_diag_msg_common_fill);
-- 
2.51.0.268.g9569e192d0-goog