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 CAEC3C433EF for ; Tue, 19 Jul 2022 12:06:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238248AbiGSMGF (ORCPT ); Tue, 19 Jul 2022 08:06:05 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38684 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238345AbiGSMEa (ORCPT ); Tue, 19 Jul 2022 08:04:30 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AE237481C3; Tue, 19 Jul 2022 05:00:22 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id EF99E61614; Tue, 19 Jul 2022 12:00:21 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id D4DB9C341C6; Tue, 19 Jul 2022 12:00:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1658232021; bh=bJBnjAVwj8iajVZYIkDU6xVk+TEZszY3WfxBZ4JXnz4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Aa/J/G/r9EIbFnfSAxClA4GRcj8u1ibCtyzQBOaUvQnMZuYha6k9vfnepyb25UTyu ph7KbCBtnmaBnyvXOi44V+090Yiu+zv8DQs14Mb7F6i7luUFd4wpCJWBEHroocmqzo jZc7RpNtXOFsQtlh/P16bSFVh0ZwQfWfqGQRQbAw= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Kuniyuki Iwashima , "David S. Miller" , Sasha Levin Subject: [PATCH 4.19 15/48] net: Fix data-races around sysctl_mem. Date: Tue, 19 Jul 2022 13:53:52 +0200 Message-Id: <20220719114521.187114313@linuxfoundation.org> X-Mailer: git-send-email 2.37.1 In-Reply-To: <20220719114518.915546280@linuxfoundation.org> References: <20220719114518.915546280@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Kuniyuki Iwashima [ Upstream commit 310731e2f1611d1d13aae237abcf8e66d33345d5 ] While reading .sysctl_mem, it can be changed concurrently. So, we need to add READ_ONCE() to avoid data-races. Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Signed-off-by: Kuniyuki Iwashima Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- include/net/sock.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/net/sock.h b/include/net/sock.h index 7d3a4c2eea95..98946f90781d 100644 --- a/include/net/sock.h +++ b/include/net/sock.h @@ -1381,7 +1381,7 @@ void __sk_mem_reclaim(struct sock *sk, int amount); /* sysctl_mem values are in pages, we convert them in SK_MEM_QUANTUM units */ static inline long sk_prot_mem_limits(const struct sock *sk, int index) { - long val = sk->sk_prot->sysctl_mem[index]; + long val = READ_ONCE(sk->sk_prot->sysctl_mem[index]); #if PAGE_SIZE > SK_MEM_QUANTUM val <<= PAGE_SHIFT - SK_MEM_QUANTUM_SHIFT; -- 2.35.1