From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 941472E3FE for ; Tue, 7 Nov 2023 12:13:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="kl1oAQzJ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 052B2C433CD; Tue, 7 Nov 2023 12:13:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1699359210; bh=yvM3vVr51XQmwke4AijdDvrRbEofYO7NBL66T+P5vaw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=kl1oAQzJEaoSeCu/8z5Aioxpoz7bevPCY8NX3rIspgPw81EJQU+1WG3rv3TIA1d11 c1E1McEoGOTnzUQ4C28ercvXVBvj4/KwMcJyau8R7uCzENUGtn9xouqXc6bARcEXGu c+ecWF0BbB+m3DYtjP3HJ28fG9JM55aRJMF8od+tucuwNVRCGNdxhRVj9xl2p06Jdr FC2JjDZZ+qZzfqcY2F9i+TV6x20I0m1MrfMXOyYs4ZAvobnTFn3IqgtocrgwKwXs/S z+oqkCTd2ZTwIRUo5g13IQ4WDZYrD/F83+LFxcJyV7gibvC9FNdCTWo/kX7SofIRih pf8pnlNVMjqmQ== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Eric Dumazet , "David S . Miller" , Sasha Levin , kuba@kernel.org, pabeni@redhat.com, dsahern@kernel.org, kuniyu@amazon.com, wuyun.abel@bytedance.com, leitao@debian.org, alexander@mihalicyn.com, dhowells@redhat.com, netdev@vger.kernel.org Subject: [PATCH AUTOSEL 4.19 5/7] net: annotate data-races around sk->sk_dst_pending_confirm Date: Tue, 7 Nov 2023 07:13:13 -0500 Message-ID: <20231107121318.3759058-5-sashal@kernel.org> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20231107121318.3759058-1-sashal@kernel.org> References: <20231107121318.3759058-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 4.19.297 Content-Transfer-Encoding: 8bit From: Eric Dumazet [ 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 Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- 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 c0df14e5a0754..81888513b3b93 100644 --- a/include/net/sock.h +++ b/include/net/sock.h @@ -1918,7 +1918,7 @@ 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); } } } @@ -1929,7 +1929,7 @@ __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); @@ -1942,7 +1942,7 @@ 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 e1d0c8c715b87..62d169bcfcfa1 100644 --- a/net/core/sock.c +++ b/net/core/sock.c @@ -496,7 +496,7 @@ struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie) if (dst && dst->obsolete && dst->ops->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 3dd62cf739e32..a0875dc60e08f 100644 --- a/net/ipv4/tcp_output.c +++ b/net/ipv4/tcp_output.c @@ -1090,7 +1090,7 @@ static int __tcp_transmit_skb(struct sock *sk, struct sk_buff *skb, skb_set_hash_from_sk(skb, sk); 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