[PATCH v1 bpf/net 2/6] sockmap: Annotate sk->sk_write_space() for UDP.
From: Kuniyuki Iwashima <kuniyu@google.com>
Date: 2026-02-15 20:43:59
Also in:
bpf
Subsystem:
bpf [l7 framework] (sockmap), networking [general], networking [sockets], the rest · Maintainers:
John Fastabend, Jakub Sitnicki, Jiayuan Chen, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Kuniyuki Iwashima, Willem de Bruijn, Linus Torvalds
UDP TX skb->destructor() is sock_wfree(), and UDP only holds lock_sock() for UDP_CORK / MSG_MORE sendmsg(). Otherwise, sk->sk_write_space() is read locklessly. Let's use WRITE_ONCE() and READ_ONCE() for sk->sk_write_space(). Signed-off-by: Kuniyuki Iwashima <kuniyu@google.com> --- net/core/skmsg.c | 2 +- net/core/sock.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/net/core/skmsg.c b/net/core/skmsg.c
index 75fa94217e1e..3d7eb2f4ac98 100644
--- a/net/core/skmsg.c
+++ b/net/core/skmsg.c@@ -1297,7 +1297,7 @@ void sk_psock_start_verdict(struct sock *sk, struct sk_psock *psock) psock->saved_data_ready = sk->sk_data_ready; WRITE_ONCE(sk->sk_data_ready, sk_psock_verdict_data_ready); - sk->sk_write_space = sk_psock_write_space; + WRITE_ONCE(sk->sk_write_space, sk_psock_write_space); } void sk_psock_stop_verdict(struct sock *sk, struct sk_psock *psock)
diff --git a/net/core/sock.c b/net/core/sock.c
index 693e6d80f501..d828f91be4e9 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c@@ -2690,7 +2690,7 @@ void sock_wfree(struct sk_buff *skb) * after sk_write_space() call */ WARN_ON(refcount_sub_and_test(len - 1, &sk->sk_wmem_alloc)); - sk->sk_write_space(sk); + READ_ONCE(sk->sk_write_space)(sk); len = 1; } /*
--
2.53.0.310.g728cabbaf7-goog