Received: by 2002:a05:6a11:4021:0:0:0:0 with SMTP id ky33csp2352926pxb; Mon, 20 Sep 2021 19:50:35 -0700 (PDT) X-Google-Smtp-Source: ABdhPJw3db5oE1zjZvPKyaBtg0t3tPRT7pw+sHGIfa0s0oNFmIZfDUap0T564PI8jNDx6CYTLM0g X-Received: by 2002:a6b:dd0c:: with SMTP id f12mr5099555ioc.117.1632192635405; Mon, 20 Sep 2021 19:50:35 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1632192635; cv=none; d=google.com; s=arc-20160816; b=aoSlkV37MJFml0XBhaP42CYB3/HMMiOw4J2p0R32KUjRWi+1CKESKdazlwKKDPEH8u eFZ94/54aEWRIHtZ3FI9gCZ9imtP+K3+DjnvorTUWF1XQYCzKSn/7tZc9uQwweTa4UEu iZfXTeD5sZGQErSjsBZ/49ZTDlt0M3yqQArKEvUnp8KlnriCclGnPEe2WcMvffVbdaZ5 bQli4JRdOz8CoWy/dktIzaBibFjXuyRNF42dq1cTS3mUH6aRFfNnE13nSBXaewKlu7V9 pTks4iwio2KLJVVj32rP79TwreUMG4xTMBFRuD4vTlImIGMfsbsc8bSLYK4YaRoW4Hsw 5TxQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :user-agent:references:in-reply-to:message-id:date:subject:cc:to :from:dkim-signature; bh=Mn7sEZfiH/iiuaNDBsgJZLLG09zKDGa1ogW56HUhBp0=; b=e61lRaFdRetCvBMa2IHOwJJfQRNF3/23zjtTP+tJH7NlHQ0GhlM2fQ51x0Uc+NxecB wfbaMUNwt3bcTW1mRMQ5VrSs2+6oGa/S40DjF40qtc65go8YC8V9YL3Yin5ttBIdv+gI pD4X5eDlu5n/IUF3/O5oanVX0PYfVHBuEVO6u9UW9nB9NcKzIQwE/z/Pgzx2nPbB3T0q VViFD7HsiJMXi15bTKNTO42UoeWA05ezjs902Y+Ru+zW6qy5nWr59mYBZ1EWBe916V1P qpgJh4kPks4WHFhWhUJ2kRPquWEKWjPQaiB9uL7vVWqenY44k8UOVcP8nwgBmuVuBmyg 5LNw== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@linuxfoundation.org header.s=korg header.b=sdlvmgfr; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linuxfoundation.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id d186si19565055iog.78.2021.09.20.19.50.23; Mon, 20 Sep 2021 19:50:35 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@linuxfoundation.org header.s=korg header.b=sdlvmgfr; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linuxfoundation.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1353663AbhITSmE (ORCPT + 99 others); Mon, 20 Sep 2021 14:42:04 -0400 Received: from mail.kernel.org ([198.145.29.99]:53124 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1381641AbhITSjB (ORCPT ); Mon, 20 Sep 2021 14:39:01 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 5366B6332A; Mon, 20 Sep 2021 17:30:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1632159022; bh=fjj9M6Yc0QaqblYN9tqxKTaCjPZmyQrweOM9c/luXqs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=sdlvmgfrvWd7EBIIu4c6okg5uODKP4idPXL9d4vMyhVE0ZLXcHGs+2Gq82Y/8cmvv cAtX8J1KLgLHUug8JvmFmjxs79Urhk5iavqWwWa+tAgOmneuG2RUpRsBd9tDSxv+TU QV0Nlu+PixGL3Ku6BZ0ljEXYouAYfohbttO7XqoM= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Eric Dumazet , "David S. Miller" Subject: [PATCH 5.14 041/168] net-caif: avoid user-triggerable WARN_ON(1) Date: Mon, 20 Sep 2021 18:42:59 +0200 Message-Id: <20210920163922.998534322@linuxfoundation.org> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20210920163921.633181900@linuxfoundation.org> References: <20210920163921.633181900@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: Eric Dumazet commit 550ac9c1aaaaf51fd42e20d461f0b1cdbd55b3d2 upstream. syszbot triggers this warning, which looks something we can easily prevent. If we initialize priv->list_field in chnl_net_init(), then always use list_del_init(), we can remove robust_list_del() completely. WARNING: CPU: 0 PID: 3233 at net/caif/chnl_net.c:67 robust_list_del net/caif/chnl_net.c:67 [inline] WARNING: CPU: 0 PID: 3233 at net/caif/chnl_net.c:67 chnl_net_uninit+0xc9/0x2e0 net/caif/chnl_net.c:375 Modules linked in: CPU: 0 PID: 3233 Comm: syz-executor.3 Not tainted 5.14.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:robust_list_del net/caif/chnl_net.c:67 [inline] RIP: 0010:chnl_net_uninit+0xc9/0x2e0 net/caif/chnl_net.c:375 Code: 89 eb e8 3a a3 ba f8 48 89 d8 48 c1 e8 03 42 80 3c 28 00 0f 85 bf 01 00 00 48 81 fb 00 14 4e 8d 48 8b 2b 75 d0 e8 17 a3 ba f8 <0f> 0b 5b 5d 41 5c 41 5d e9 0a a3 ba f8 4c 89 e3 e8 02 a3 ba f8 4c RSP: 0018:ffffc90009067248 EFLAGS: 00010202 RAX: 0000000000008780 RBX: ffffffff8d4e1400 RCX: ffffc9000fd34000 RDX: 0000000000040000 RSI: ffffffff88bb6e49 RDI: 0000000000000003 RBP: ffff88802cd9ee08 R08: 0000000000000000 R09: ffffffff8d0e6647 R10: ffffffff88bb6dc2 R11: 0000000000000000 R12: ffff88803791ae08 R13: dffffc0000000000 R14: 00000000e600ffce R15: ffff888073ed3480 FS: 00007fed10fa0700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2c322000 CR3: 00000000164a6000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: register_netdevice+0xadf/0x1500 net/core/dev.c:10347 ipcaif_newlink+0x4c/0x260 net/caif/chnl_net.c:468 __rtnl_newlink+0x106d/0x1750 net/core/rtnetlink.c:3458 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3506 rtnetlink_rcv_msg+0x413/0xb80 net/core/rtnetlink.c:5572 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2504 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1340 netlink_sendmsg+0x86d/0xdb0 net/netlink/af_netlink.c:1929 sock_sendmsg_nosec net/socket.c:704 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:724 __sys_sendto+0x21c/0x320 net/socket.c:2036 __do_sys_sendto net/socket.c:2048 [inline] __se_sys_sendto net/socket.c:2044 [inline] __x64_sys_sendto+0xdd/0x1b0 net/socket.c:2044 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Fixes: cc36a070b590 ("net-caif: add CAIF netdevice") Signed-off-by: Eric Dumazet Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- net/caif/chnl_net.c | 19 +++---------------- 1 file changed, 3 insertions(+), 16 deletions(-) --- a/net/caif/chnl_net.c +++ b/net/caif/chnl_net.c @@ -53,20 +53,6 @@ struct chnl_net { enum caif_states state; }; -static void robust_list_del(struct list_head *delete_node) -{ - struct list_head *list_node; - struct list_head *n; - ASSERT_RTNL(); - list_for_each_safe(list_node, n, &chnl_net_list) { - if (list_node == delete_node) { - list_del(list_node); - return; - } - } - WARN_ON(1); -} - static int chnl_recv_cb(struct cflayer *layr, struct cfpkt *pkt) { struct sk_buff *skb; @@ -364,6 +350,7 @@ static int chnl_net_init(struct net_devi ASSERT_RTNL(); priv = netdev_priv(dev); strncpy(priv->name, dev->name, sizeof(priv->name)); + INIT_LIST_HEAD(&priv->list_field); return 0; } @@ -372,7 +359,7 @@ static void chnl_net_uninit(struct net_d struct chnl_net *priv; ASSERT_RTNL(); priv = netdev_priv(dev); - robust_list_del(&priv->list_field); + list_del_init(&priv->list_field); } static const struct net_device_ops netdev_ops = { @@ -537,7 +524,7 @@ static void __exit chnl_exit_module(void rtnl_lock(); list_for_each_safe(list_node, _tmp, &chnl_net_list) { dev = list_entry(list_node, struct chnl_net, list_field); - list_del(list_node); + list_del_init(list_node); delete_device(dev); } rtnl_unlock();