From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B5A43C2BB41 for ; Tue, 16 Aug 2022 08:04:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231615AbiHPIE6 (ORCPT ); Tue, 16 Aug 2022 04:04:58 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44824 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230287AbiHPIDj (ORCPT ); Tue, 16 Aug 2022 04:03:39 -0400 Received: from smtp-fw-9102.amazon.com (smtp-fw-9102.amazon.com [207.171.184.29]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 995878A1CF; Mon, 15 Aug 2022 22:26:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amazon.com; i=@amazon.com; q=dns/txt; s=amazon201209; t=1660627595; x=1692163595; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=V+V7SGE1WHozIaXLIy6WGjvIZ5CklIm6fLWTrqxbonM=; b=FoJYAccZPGPLfdrs02a1qHq7znBabporIiKbvKa5bi/M0Wtl6b/iOGC+ 8/SqZiEhxAXvLTlN5ROADLSSBcx8Nz5zi9oZcGlNmVBEMRX/k8flBtlq9 yUrFyIqA45SrN7pRItZLzJMOG9sd9tHKxXRRxrRxyNz5wJpuvk9eBhVsr 8=; X-IronPort-AV: E=Sophos;i="5.93,240,1654560000"; d="scan'208";a="249243085" Received: from pdx4-co-svc-p1-lb2-vlan2.amazon.com (HELO email-inbound-relay-iad-1a-87b71607.us-east-1.amazon.com) ([10.25.36.210]) by smtp-border-fw-9102.sea19.amazon.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 16 Aug 2022 05:26:19 +0000 Received: from EX13MTAUWB001.ant.amazon.com (iad12-ws-svc-p26-lb9-vlan3.iad.amazon.com [10.40.163.38]) by email-inbound-relay-iad-1a-87b71607.us-east-1.amazon.com (Postfix) with ESMTPS id 5A872141032; Tue, 16 Aug 2022 05:26:16 +0000 (UTC) Received: from EX19D004ANA001.ant.amazon.com (10.37.240.138) by EX13MTAUWB001.ant.amazon.com (10.43.161.207) with Microsoft SMTP Server (TLS) id 15.0.1497.38; Tue, 16 Aug 2022 05:26:15 +0000 Received: from 88665a182662.ant.amazon.com (10.43.160.55) by EX19D004ANA001.ant.amazon.com (10.37.240.138) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA) id 15.2.1118.12; Tue, 16 Aug 2022 05:26:13 +0000 From: Kuniyuki Iwashima To: "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni CC: Kuniyuki Iwashima , Kuniyuki Iwashima , , Subject: [PATCH v1 net 08/15] net: Fix data-races around netdev_tstamp_prequeue. Date: Mon, 15 Aug 2022 22:23:40 -0700 Message-ID: <20220816052347.70042-9-kuniyu@amazon.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220816052347.70042-1-kuniyu@amazon.com> References: <20220816052347.70042-1-kuniyu@amazon.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [10.43.160.55] X-ClientProxiedBy: EX13D24UWB003.ant.amazon.com (10.43.161.222) To EX19D004ANA001.ant.amazon.com (10.37.240.138) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org While reading netdev_tstamp_prequeue, it can be changed concurrently. Thus, we need to add READ_ONCE() to its readers. Fixes: 3b098e2d7c69 ("net: Consistent skb timestamping") Signed-off-by: Kuniyuki Iwashima --- net/core/dev.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/net/core/dev.c b/net/core/dev.c index 07da69c1ac0a..4705e6630efa 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -4928,7 +4928,7 @@ static int netif_rx_internal(struct sk_buff *skb) { int ret; - net_timestamp_check(netdev_tstamp_prequeue, skb); + net_timestamp_check(READ_ONCE(netdev_tstamp_prequeue), skb); trace_netif_rx(skb); @@ -5281,7 +5281,7 @@ static int __netif_receive_skb_core(struct sk_buff **pskb, bool pfmemalloc, int ret = NET_RX_DROP; __be16 type; - net_timestamp_check(!netdev_tstamp_prequeue, skb); + net_timestamp_check(!READ_ONCE(netdev_tstamp_prequeue), skb); trace_netif_receive_skb(skb); @@ -5664,7 +5664,7 @@ static int netif_receive_skb_internal(struct sk_buff *skb) { int ret; - net_timestamp_check(netdev_tstamp_prequeue, skb); + net_timestamp_check(READ_ONCE(netdev_tstamp_prequeue), skb); if (skb_defer_rx_timestamp(skb)) return NET_RX_SUCCESS; @@ -5694,7 +5694,7 @@ void netif_receive_skb_list_internal(struct list_head *head) INIT_LIST_HEAD(&sublist); list_for_each_entry_safe(skb, next, head, list) { - net_timestamp_check(netdev_tstamp_prequeue, skb); + net_timestamp_check(READ_ONCE(netdev_tstamp_prequeue), skb); skb_list_del_init(skb); if (!skb_defer_rx_timestamp(skb)) list_add_tail(&skb->list, &sublist); -- 2.30.2