From 9a25f0cb0d7ee689f54f38890e66bc78520b0c62 Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Wed, 15 Mar 2023 20:57:42 +0000 Subject: dccp: annotate lockless accesses to sk->sk_err_soft This field can be read/written without lock synchronization. Signed-off-by: Eric Dumazet Signed-off-by: David S. Miller --- net/dccp/ipv4.c | 12 +++++++----- net/dccp/ipv6.c | 11 ++++++----- net/dccp/timer.c | 2 +- 3 files changed, 14 insertions(+), 11 deletions(-) (limited to 'net/dccp') diff --git a/net/dccp/ipv4.c b/net/dccp/ipv4.c index b780827f5e0a..3ab68415d121 100644 --- a/net/dccp/ipv4.c +++ b/net/dccp/ipv4.c @@ -177,7 +177,7 @@ static inline void dccp_do_pmtu_discovery(struct sock *sk, * for the case, if this connection will not able to recover. */ if (mtu < dst_mtu(dst) && ip_dont_fragment(sk, dst)) - sk->sk_err_soft = EMSGSIZE; + WRITE_ONCE(sk->sk_err_soft, EMSGSIZE); mtu = dst_mtu(dst); @@ -339,8 +339,9 @@ static int dccp_v4_err(struct sk_buff *skb, u32 info) sk_error_report(sk); dccp_done(sk); - } else - sk->sk_err_soft = err; + } else { + WRITE_ONCE(sk->sk_err_soft, err); + } goto out; } @@ -364,8 +365,9 @@ static int dccp_v4_err(struct sk_buff *skb, u32 info) if (!sock_owned_by_user(sk) && inet->recverr) { sk->sk_err = err; sk_error_report(sk); - } else /* Only an error on timeout */ - sk->sk_err_soft = err; + } else { /* Only an error on timeout */ + WRITE_ONCE(sk->sk_err_soft, err); + } out: bh_unlock_sock(sk); sock_put(sk); diff --git a/net/dccp/ipv6.c b/net/dccp/ipv6.c index b9d7c3dd1cb3..47fb10834223 100644 --- a/net/dccp/ipv6.c +++ b/net/dccp/ipv6.c @@ -174,17 +174,18 @@ static int dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, */ sk_error_report(sk); dccp_done(sk); - } else - sk->sk_err_soft = err; + } else { + WRITE_ONCE(sk->sk_err_soft, err); + } goto out; } if (!sock_owned_by_user(sk) && np->recverr) { sk->sk_err = err; sk_error_report(sk); - } else - sk->sk_err_soft = err; - + } else { + WRITE_ONCE(sk->sk_err_soft, err); + } out: bh_unlock_sock(sk); sock_put(sk); diff --git a/net/dccp/timer.c b/net/dccp/timer.c index 27a3b37acd2e..b3255e87cc7e 100644 --- a/net/dccp/timer.c +++ b/net/dccp/timer.c @@ -19,7 +19,7 @@ int sysctl_dccp_retries2 __read_mostly = TCP_RETR2; static void dccp_write_err(struct sock *sk) { - sk->sk_err = sk->sk_err_soft ? : ETIMEDOUT; + sk->sk_err = READ_ONCE(sk->sk_err_soft) ? : ETIMEDOUT; sk_error_report(sk); dccp_send_reset(sk, DCCP_RESET_CODE_ABORTED); -- cgit v1.2.3-58-ga151